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Crunch time is an important or critical time when a decisive or difficult decision has to be made.
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Ping is a short sharp sound - like a microwave makes to alert you that the food in it is cooked. But the word ping is also an informal way of describing sending an email or a text message. So if I ping you an email, I basically send you an email.
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Step on it means go faster, be quicker or hurry up.
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Something that is a necessary evil is something bad that can't be avoided, and you have to accept it in order to achieve a good result.
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