work like a beaver Meaning: work very energetically and hard. Example: Ahead of the Diwali festival, she worked like a beaver to clean out all the closets.
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tighten belt ❯❮ a bed of roses
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be up on
Meaning: be well informed about a matter or subject
Example: If you want to start teaching English to grown-up kids, you need to be up on it else you're going to be unable to clarify their doubts. Read on
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