a nod's as good as a wink

a nod is as good as a wink

It is unnecessary to explain or elaborate upon something because one already understands or knows enough about it. No need to tell me what you were up to last night—a nod's as good as a wink to a blind horse.
See also: good, nod, wink
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

a nod's as good as a wink

BRITISH, HUMOROUS
If you say a nod's as good as a wink, you mean that it is not necessary to explain something further, because you understand what someone has indirectly suggested to you. Say no more. A nod's as good as a wink. Note: This comes from the saying `a nod's as good as a wink to a blind horse', which suggests that both the nod and the wink are equally useless, as the horse would not be able to see either.
See also: good, wink
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

a nod's as good as a wink

there's no need for further elaboration or explanation.
This is a shortened form of the proverb, dating from the late 18th century, a nod is as good as a wink to a blind horse , used to convey that a mere hint or suggestion can be or has been understood. A nod and a wink is also used to mean ‘a hint or innuendo’.
See also: good, wink
Farlex Partner Idioms Dictionary © Farlex 2017
See also: