a nod's as good as a wink

nod's as good as a wink

An acknowledgement of the true but hidden meaning of an expression or statement. Primarily heard in UK, Australia. Even though you said otherwise, I know you really have no interest in going out tonight—a nod's as good as a wink.
See also: good, wink

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