(US, Midwestern US and Appalachia) You (plural, as subject or object).

(informal) An instant; an extremely short time.

An acute febrile illness of tropical regions, caused by a flavivirus (Yellow fever virus) and spread by certain mosquitoes, characterised by jaundice, black vomit and the absence of urination.

(sports) a yellow-coloured card, shown to a player (especially in association football) as a caution that he or she has committed a flagrant foul; a further such foul would result in a red card.

An arm of the Pacific Ocean between mainland China and the Korean peninsula.

(idiomatic) The inexperienced, youthful prime of an individual, group, organization or entity.

Nonstandard spelling of you.

(informal) Yeah; yes.

(UK dialectal, West Country, Northern England, Scotland) yea; yes

(informal) Go. (Spoken to horses and cattle.)