What is the idiom that means to be very busy?

Practice Questions

Q1
What is the idiom that means to be very busy?
  1. Burning the midnight oil.
  2. Caught between a rock and a hard place.
  3. Barking up the wrong tree.
  4. Throwing in the towel.

Questions & Step-by-Step Solutions

What is the idiom that means to be very busy?
No concepts available.
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