something, for example, a remark, that is very insulting and unfair. The expression comes from boxing, where it is illegal to hit an opponent below the belt
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An ace up your sleeve
a secret plan, idea, or advantage that can be used if and when it is needed. The expression comes from card games, where the “ace” is usually the highest card
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Caught with your pants down
to be completely surprised by something because you are not prepared for it. The idiom is similar to “caught red-handed”
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Dressed to the nines/dressed to kill
wearing nice clothes for a special occasion. Another idiom with a similar meaning is “dolled up”, or “gussied up”
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Fine-tooth comb
if you go through something with a fine-tooth comb, you examine it very carefully
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Kid gloves
if you treat someone with kid gloves, you deal with them very gently or carefully
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Birthday suit
if you are in your birthday suit, you are not wearing any clothes. This refers to the fact that people are naked when they are born
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Walk a mile in someone’s shoes
you should try to understand someone before criticising them. The full idiom is: Before you judge someone, walk a mile in their shoes
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Tighten your belt
to spend less money than you did before
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Dirty laundry
questionable activities that one wants to keep secret. “To wash your dirty laundry/linen in public” or to “air your dirty laundry/linen in public”
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Hot under the collar
very angry about something
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Off the cuff
if you speak off the cuff, you say something without having prepared or thought about your words first
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Hat / cap in hand
being very humble, usually asking for a favour or apologising for something bad you have done
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Thinking cap
if you put on your thinking cap, you think seriously about something