In American English, keeping your fingers crossed means that you are hoping for the best possible outcome.
When you say you are under the weather, it means you are sick or not feeling well.
If people say my ears were burning, it means someone was talking about them, but they weren't there to hear it.
“Off the top of my head” is a common phrase that means I am trying to remember something, and to give you a quick answer.
Pins are small and don't make noise when they fall to the floor. So when you say you can “hear a pin drop,” it means that the room is silent.
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