a little bird told me sth (idm), sb told me sth but I won't tell you who, be a fly on the wall (idm), to hear or see what is happening without being noticed, hear sth from the horse's mouth (idm), to find out about sth directly from the person, let the cat out of the bag (idm), to give away a secret accidentally, a walk in the park (idm), (of a task, an activity, etc) very easy, as easy as ABC (idm), extremely simple, hit the books (idm), to start studying a lot, lost in thought (idm), thinking so much about sth that I don’t pay attention to what's happening around me, put my thinking cap on (idm), to start thinking deeply about sth, come back down to Earth (idm), to be realistic, live on another planet (idm), to be out of touch with reality, not rocket science (idm), very simple, once in a blue moon (idm), very rarely, over the moon (idm), very happy

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