1. Slip one's mind if something slips your mind, you forget it
适用于你在等某人开始一件事，但他却拖拖拉拉
2. Slip one's mind on doing sth.
完全忘记做某事
3. Slip one's mind if something slips your mind, you forget it eg: I meant to buy some milk, but it completely slipped my mind.
何事耽误？在等什么？适用于你在等某人开始一件事，但他却拖拖拉拉。
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verb