Undertook
Undertook.
undertow
Undertow direction
Underused auto parts
Underutilize
undervaluation
Undervalue
Undervalued
undervitamised
Underwater
Underwater activity
Underwater activity that requires the ends of 16-, 20-, 53- and 58-Across
Underwater aid
Underwater area pumped dry to allow for construction
Underwater asteroid
underwater attractions
Underwater barrier
Underwater bloodsucker
Underwater boat
Underwater boat, for short
Underwater breather
UNDERWATER breathing aid
Underwater breathing aids
Underwater breathing apparatus
Underwater breathing gear
Underwater breathing organ
Underwater breathing organs
Underwater cave dweller
UNDERWATER chamber
UNDERWATER construction chamber
Underwater coral collection
Underwater coral structure
Underwater craft
Underwater craft, briefly
Underwater creature trained to fly?
Underwater creature trained to play an instrument?
Underwater current generator
Underwater deposit
Underwater detection device
Underwater detection system
Underwater detector
Underwater detector?
Underwater directors
Underwater disturbances
UNDERWATER diver
Underwater diver's gear
Underwater diving gear
Underwater ecosystems
Underwater eggs
Underwater electricity source
Underwater escape mechanism
Underwater excavation machine
Underwater experiment site
Underwater experimentation station
underwater explorer
Underwater explosive
Underwater families
Underwater finder
Underwater fishing aid
Underwater forest plant
Underwater gear
Underwater gear, briefly
Underwater growth
Underwater habitat
Underwater habitat of the 1960s
Underwater habitat, once
UNDERWATER hardening
Underwater Hazard
Underwater hazards
Underwater ink squirter
Underwater ink stains?
Underwater killer
Underwater knoll
underwater location equipment
Underwater menace
underwater mislie
Underwater missile
Underwater Missile American
Underwater navigation aid
Underwater navigation tool
Underwater object locater
Underwater obstacle
Underwater organ
UNDERWATER plant
Underwater power source?
Underwater predator
Underwater projectile
Underwater projection
Underwater propeller?
Underwater ray
Underwater research site
Underwater researcher
UNDERWATER ridge
Underwater river valley
Underwater rock ridge
Underwater salvager, e.g.
Underwater sandbank
underwater search vessel
Underwater shelf
Underwater shelter
Underwater shocker
Underwater skate part
Underwater slitherer
Underwater slitherers
Underwater snorkeling done behind metal bars
UNDERWATER sound detector
Underwater sound device
Underwater sport
underwater sportsman
Underwater stabilizer
Underwater steerer
Underwater steering mechanisms
Underwater surface
underwater swimmer
Underwater swimmer with breathing apparatus
Underwater tank
Underwater test site
Underwater tracker
Underwater tracking device
Underwater transmission
Underwater trap
Underwater treasure
UNDERWATER tree stump
underwater vanes used to steer vessels controlled by means of a wheel or tiller
Underwater vessel
Underwater vessel, briefly
Underwater vessel, for short
Underwater vessels
Underwater vessels, for short
Underwater wave generator
Underwater weapon
Underwater wiggler
Underwater worker
Underwater wrigglers
Underway
Underway to over there
Underway, as a game
Underway, in a way
Underway, to Holmes
Underway, to Sherlock
Underway, to Sherlock Holmes
Underwear
Underwear brand
Underwear brand promoted by Michael Jordan
Underwear brand that recently ended their relationship with Charlie Sheen
Underwear choice
Underwear component
underwear for dogs
Underwear from the First State?
Underwear initials
Underwear irritant, at times
Underwear letters
Underwear logo
Underwear material
Underwear name
Underwear option
underwear or trousers
Underwear promoted by Michael Jordan
underwear that shapes body
Underwear top
Underwear type
Underwear with underwire
underweight
Underweight delivery, maybe
Underwent
Underwent a recession
Underwent detente
Underwent recession
Underwhelming
Underwire ___
Underwire garment
Underwire undergarment
Underwire underwear
Underwired garments
underwood
Underwood pounders
Underwood who performs the "Sunday Night Football" opening
underworld
Underworld activities
Underworld area
Underworld baddie
Underworld bigwig
Underworld bigwigs
Underworld boater
Underworld boss
Underworld boss Keyser of "The Usual Suspects"
Underworld boss, slangily
Underworld bosses
Underworld deity
UNDERWORLD denizen
Underworld denizens
Underworld director Wiseman
Underworld family
Underworld family member
Underworld ferryman's post
Underworld figure
Underworld figures
Underworld figures may cross it
Underworld figures?
Underworld flower
Underworld god
Underworld goddess
Underworld group
Underworld group, with "the"
Underworld higher-up
Underworld king in Greek myth
Underworld leader
Underworld lingo
Underworld network
Underworld of Greek myth
Underworld of Greek mythology
Underworld of myth
Underworld of mythology
Underworld office
Underworld offices
Underworld overlord
Underworld overlord, in crookspeak
Underworld party
Underworld piece
underworld river
Underworld river of mythology
Underworld route
Underworld ruler
Underworld society
Underworld talk
Underworld thug
Underworld V.I.P.'s
Underworld, in Greek mythology
underworldly
Underwrite
Underwrite expenses
Underwriter
Underwriter's assessment
Underwriter's concern
underwriting
Underwriting?
Underwritten
Underwritten?
Underwrote
undescribable
undeserved
Undeserved blame
Undeserved charge
Undeserved charges
Undeserved infamy
Undeserved notoriety
Undeserved passing grades, perhaps
Undeserved rep
Undeserved reputation