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Up to one’s chin

Very busy with something, deeply involved in something.

The mayor has been up to his chin in the project to build a new convention center.

Related Idioms

Act up

To misbehave. The children began to act up during the field trip. Read more →

Add up

To total up to a certain amount. I will add up the money that I owe to my father and give it to him. Read more →