1 [C] something that is not or must not be known by other people 秘密;机密:
to keep a secret保守秘密to let sb in on/tell sb a secret向别人泄露秘密I can't tell you where we're going -- it's a secret.我不能告诉你我们要去哪里─这是秘密。It's no secret that they don't like each other (= everybody knows).他们都不喜欢对方,这已不是什么秘密。
2 [sing] the secret (of/to sth/doing sth) the only way or the best way of doing or achieving sth 秘诀;窍门:
What is the secret of your success (= how did you become so successful)?你成功的秘诀是什么?
in secret without other people knowing 秘密地;暗地里:
to meet in secret暗中见面