Meaning of “a nod is as good as a wink” in the English Dictionary

british dictionary

"a nod is as good as a wink" in British English

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a nod is as good as a wink

saying

used to say that only a slight sign is needed for you to understand clearly what is meant by something or what is happening in a situation

(Definition of “a nod is as good as a wink” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)