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Threaten (v. t.) To utter threats against; to menace; to inspire with apprehension; to alarm, or attempt to alarm, as with the promise of something evil or disagreeable; to warn.
Threaten (v. t.) To exhibit the appearance of (something evil or unpleasant) as approaching; to indicate as impending; to announce the conditional infliction of; as, to threaten war; to threaten death.
Threaten (v. i.) To use threats, or menaces; also, to have a threatening appearance.