the.com/killer

Can mean murderer or masterpiece, depending entirely on your tone of voice.

means Someone or something that kills — literally a person who murders, or loosely, anything impressively effective, intense, or excellent.

from Straightforward: 'kill' plus the agent suffix '-er,' meaning 'one who kills.' The verb 'kill' goes back to Middle English 'killen,' meaning to strike or hit before it narrowed to mean causing death — its deeper roots are murky, possibly related to 'quell.' The slang swerve into 'impressive' or 'excellent' (a 'killer app,' a 'killer smile') is newer, a 20th-century American English habit of turning violent words into intensifiers — same instinct that gave us 'that's sick' or 'this is savage.'

grammar flex
works as noun, adjective, or pure vibe
origin
from kill, surprisingly from Old Norse
slang shift
1970s turned it into high praise
same word
describes serial killers and killer playlists
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