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"U" Word Origins

Where do words come from? Trace the origin and history of any English word, from its Latin, Greek or Old English roots through to its modern meaning. Every etymology is sourced.

“U” Word Origins

undecimber
Origin
From Latin undecim (“eleven”); formed as logical continuation to December, which in its turn is derived from Latin decem (“ten”), as it was the tenth month in the Roman calendar. It is unclear whether the term was ever used in Classic Latin as a name for an intercalary month.
undefeated
Origin
From un- + defeated.
undefiled
Origin
From un- + defiled.
undeflowered
Origin
From un- + deflowered.
undelicious
Origin
From un- + delicious.
undelight
Origin
From un- + delight.
undemonstrative
Origin
From un- + demonstrative.
undeniable
Origin
From un- + deny + -able — literally, "not able to be denied."
undeniably
Origin
From undeniable + -ly.
under
Latin
From Old English under, from Proto-Germanic *under, related to German unter and Latin infra ("below") — an ancient word for "beneath" going back to Proto-Indo-European.
under the weather
Origin
From under the weather bow (“affected by bad weather; seasick”); weather bow is a nautical term referring to the side of a ship exposed to bad weather.
underachiever
Origin
From underachieve + -er or under- + achiever.
underactive
Origin
From under- + active.
underage
Origin
From under- + age.
underarm
Origin
From under- + arm. The armpit sense is not old, historically speaking (1920s), and it is believed to have arisen as a euphemism in advertising.
underbelly
Origin
From under- + belly.
underbody
Origin
From under + body.
underbring
Origin
From under- + bring.
undercarriage
Origin
From under- + carriage.
underclothes
Origin
From under + clothes.
undercover
Origin
From under + cover, in the sense of "hidden."
undercroft
Origin
From under- + croft (crypt).
undercut
Middle English
From Middle English undercutten, from under- + cut.
underdog
Origin
From under- + dog, originally likening the loser to the dog that ends up pinned beneath its opponent in a fight.
underestimate
Origin
From under- + estimate.
underfoot
Middle English
From Middle English underfote, from under- + foot.
undergang
Origin
From Middle English undergangen (“to undego, endure, be baptised”), from Old English undergangan (“to undergo”); equivalent to under- + gang (“to walk, step, go”).
undergarment
Origin
From under- + garment.
undergo
Old English
From Old English undergān, "to undergo, undermine," from under- + go.
undergoer
Origin
From undergo + -er.
undergrad
Origin
A shortened form of undergraduate.
undergraduate
Origin
From under- + graduate — literally, someone below the rank of a graduate.
underground
Middle English
From Middle English undergrounde, from under + ground.
undergrowth
Origin
From under- + growth.
underguess
Origin
From under- + guess.
underhand
Origin
From under + hand.
underhanded
Origin
From under- + handed.
underhill
Origin
Built from "under" plus "hill" — literally describing something positioned beneath or at the foot of a hill.
underjoin
Origin
From Middle English underjoinen, equivalent to under- + join.
underjudge
Origin
From under- + judge.
underline
Origin
From under- + line.
underling
Old English
From Old English underling, formed from under + the suffix -ling (as in "duckling").
underlying
Origin
Formed from underlie plus the ending -ing.
undermine
Origin
From under- plus mine, originally meaning to dig a tunnel beneath a wall to bring it down.
undern
Origin
From Middle English undern, ondern, from Old English undern (“third hour of the day; nine o'clock; morning”), from Proto-Germanic *undurniz (“interval”), from Proto-Indo-European *h₁n̥ter, *h₁enter (“between”). Cognate with dialectal Dutch onder, dialectal German Untern, dialectal Swedish undarn.
underneath
Old English
From Old English underneoðan, from under plus neoðan ("from below"); related to the word "beneath."
underpaid
Origin
From under- ("too little") plus paid, the past tense of pay.
underpants
Origin
From under- plus pants.