The cardinal number occurring after twenty and before twenty-two, represented in Roman numerals as XXI and in Arabic numerals as 21.

(agriculture) To use a disc harrow to turn the soil and kill weeds, in preparation for planting seeds.

(idiomatic) Close to death.

Partial or biased in favour of one faction or demographic group. / With one competitor dominant over the other. / Out of proportion or lopsided. / Having only one side, like a Möbius strip.

Allowing movement in only one direction; unidirectional. / Allowing travel in only one direction.

(reciprocal pronoun) Used of a reciprocal relationship among a group of two or more people or things; compare each other.

(set phrase) At some unspecified time in the future. / At some unspecified time in the past. / Used other than figuratively or idiomatically: see one, day.

Alternative form of one up

Alternative form of one up

The art or practice of successively outdoing a competitor. / A succession of instances of outdoing a competitor.