To take on a task that is too big or ambitious to handle.
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To take on more work or responsibility than you can handle.
When you bite off more than you can chew, the job turns out harder or longer than you expected.
It's often used when someone promises more than they can deliver.
"Spread Yourself Too Thin"
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Try to do too many things at once, leaving too little energy for each
"Get in Over Your Head"
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Be in a situation that is already too difficult to manage
"Bite off More than You Can Chew"
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Take on too much and struggle to manage it