To remove a piece of something by biting and pulling it away.
"She bit off a small piece of the dark chocolate and let it melt on her tongue."
To sever something with the teeth; or figuratively, to take on more than one can handle.
To use your teeth to break a piece off, OR to take on too much of something.
2 meanings, ordered from most common to least. Color-coded by CEFR level.
To remove a piece of something by biting and pulling it away.
"She bit off a small piece of the dark chocolate and let it melt on her tongue."
To take on or attempt more than one is capable of handling (usually in the phrase 'bite off more than one can chew').
"He bit off more than he could chew when he agreed to run three committees at the same time."
We've bitten off more than we can chew.
— Commonly attributed usage; widely cited in business and political contexts, including by various U.S. senators during Congressional debates
To bite a piece off something — severing it with the teeth.
To use your teeth to break a piece off, OR to take on too much of something.
The literal sense is straightforward and physical. The figurative sense almost always appears in the fixed expression 'bite off more than one can chew.' The expression 'bite someone's head off' is a related but distinct idiom meaning to respond very angrily.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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