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Bite off more than one can chew
Meaning:
To try to do something that is too difficult
If you bite off more than you can chew, you try to do more than you are able to.
Example: She has bitten off more than she can chew again. She has agreed to finish 3 very difficult projects by the end of this year.
Do your best. Do whatever you can, but don't bite off more than you can chew.