Cách sử dụng
The expression "a nod and a wink" is used when people secretly understand something without explicitly saying it. It implies that there is a mutual understanding between two people that is not meant to be shared with others. For example, if two people are having a conversation and they both understand that they are talking about something they shouldn't be discussing openly, they may exchange a nod and a wink to acknowledge their shared understanding without speaking the words aloud.