wit /ˈwɪt/ noun
plural wits
plural wits
Learner's definition of WIT
[noncount] : an ability to say or write things that are clever and usually funny
[count] : a person who is known for making clever and funny remarks see also half-wit, nitwit
wits [plural] : the ability to think or reason
see also battle of wits at 1battle
the wit : the ability to make good decisions

at (your) wit's end

(chiefly US) or at (your) wits' end
: not able to continue thinking or trying to solve a problem : upset and unable to think of what needs to be done

out of your wits

used for emphasis with verbs like scare and frighten

to wit

used before stating the specific thing or example being discussed