verb
to communicate an intention to inflict harm or loss on someone or something
adjective
feeling at risk or in danger
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The company threatened legal action against the competitor for patent infringement.
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He threatened to tell the teacher about our prank if we didn't give him his lunch money.
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The bully threatened to beat him up if he didn't hand over his lunch money.
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The dark clouds threatened rain as we hurried to finish our picnic.