(obsolete, uncountable) Something; thing; stuff. / (countable) The identity of a thing, as an answer to a question of what.

(Manglish, Singlish) Emphasizes the truth of an assertion made to contradict an evidently false assumption held by the listener.

(interrogative) Which, especially which of an open-ended set of possibilities. / (relative) Which; the ... that. / (relative) Any ... that; all ... that; whatever.

(interrogative) In what way; to what extent.

(idiomatic) Owing to; because of; as a result of.

plural of what; used as a stand-in to collectively pluralize arbitrary instances of things. Often used along with whys, hows, etc.

(literally, sometimes philosophical) This thing has its own distinct nature; this thing is itself.

(idiomatic) So what? Who cares? Expresses disinterest, disregard or lack of concern.

(informal) A speculation as to what might have happened if something else had happened earlier.

(informal) To speculate about the consequences of something that could have happened.