Definition of monkey noun from the Oxford Advanced Learner's Dictionary

monkey

noun

ˈmʌŋki

ˈmʌŋki

1 an animal with a long tail, that climbs trees and lives in hot countries. There are several types of monkey and they are related to apes and humans.2 (informal) a child who is active and likes playing tricks on peopleCome here, you cheeky little monkey!3 (British English, slang) £500

Idioms

I don't/couldn't give a monkey's

(British English, slang) used to say, in a way that is not very polite, that you do not care about something, or are not at all interested in itI don't give a monkey's whether you want to come or not.

make a monkey (out) of somebody

to make somebody seem stupid

more at brass monkeys at brass