The term may imply illegal activity when used with firearms, as silencers are regulated. The movie's villain used a silencer to avoid detection by the police.
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Stealth Operations
In military or spy contexts, a silencer is often associated with stealth and secrecy. The spy equipped his gun with a silencer for the covert operation.
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Media Portrayal
Silencers are often dramatized in media, appearing quieter than they are in reality. On the show, the hitman's gun with a silencer made a faint 'pfft' noise.