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 actually handle.
When you bite off more than you can chew, you agree to do something that turns out to be too difficult or too much.
It’s often used when someone overestimates their abilities or available time.
"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