verb
to act or speak without thinking carefully beforehand
adverb
in a hasty or impulsive manner
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It's important to carefully consider all options before making a decision, so you don't go off half cocked.
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Don't just rush into things without thinking it through, you don't want to go off half cocked.
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Dude, don't be so impulsive, you always go off half cocked.
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She tends to go off half cocked when she's angry, without considering the consequences.