playing with fire
verb

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to do something dangerous or risky
the last straw / the final straw
noun phrase

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a final occurence in a series of unpleasant events that makes a person decide to terminate or leave the bad situation
throw in the towel
verb phrase

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to admit defeat, quit, or give up
trial and error
noun

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a process of finding out the best way to achieve a desired result by trying different methods
once and for all
adverbial phrase

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completely and finally
under the weather
adjective

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to feel or appear to feel unwell
have something up one's sleeve
idiom

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to have a secret plan or idea that you can use later on, usually to surprise someone else with
turn a blind eye
verb phrase

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to intentionally ignore something or someone, usually as a means for rules or laws to be broken
break the bank
verb

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to cost or spend more than one can afford
bite off more than you can chew
idiom

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to try to do something that may be too difficult for you to accomplish
blow off steam / let off steam
idiom

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to do or say something that helps you get rid of strong feelings, especially when you are stressed or feeling overwhelmed
blow one's own horn / toot one's own horn
idiom

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to proudly emphasize or mention your own accomplishments and achievements, especially to other people
clean as a whistle
idiom

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very clean, innocent, or pure
clear the air
verb phrase

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to ease or lighten a tense situation by speaking honestly and openly about worries, troubles, and doubts people might have
fall on deaf ears
verb

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(of a statement) to be ignored or disregarded
dig one's heels in
verb phrase

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to remain firm in one's decisions, beliefs, feelings, etc.
down to earth
adjective

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(of a person) practical, sensible, and approachable
draw the line
verb phrase

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to set a limit on what one is willing to do or accept
shot in the arm
noun

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something that created a sudden and positive effect that encourages progress
get off your high horse
verb phrase

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to stop talking or acting like one is better than the person that they are talking to