showing that you know or understand about something that is supposed to be secret 会意的；心照不宣的；知情的 a knowing smile 会意的微笑 The man at reception gave her the key with a knowing look. 接待处的那个人以熟悉的眼神把钥匙给了她。
Oxford Collocations DictionaryKnowing is used with these nouns:- glance
- grin
- look
- …