(idiomatic) To harm oneself as a result of attempting to harm an adversary.

(less common) Synonym of bite off more than one can chew

(idiomatic) To act in a haphazard or aimless way; to act frantically or without control.

present participle of run around like a chicken with its head cut off

Third-person singular simple present indicative form of run around like a chicken with its head cut off

simple past tense of run around like a chicken with its head cut off

present participle of cut off one's nose to spite one's face