In hot water, to be in serious trouble, Butterflies in your stomach, to be nervous or anxious, Under the weather, to be ill or sad, Hold your horses, to wait or to slow down, A piece of cake, something that is very easy, Knock your socks off, to be amazed or impressed, Let the cat out off the bag, to reveal a secret usually unintentionally, At the drop off a hat, immediately without any delay or hesitation, Cost an arm and a leg, to be very expensive, Pull one's leg, To joke, Caught between two stools, To be unable to choose between two alternatives, Lose your marbles, To act in a crazy or strange way, Hit the sack, To go to bed, All ears, To listen attentively, Cold feet, to lose courage.

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