FluentPlex

killer

/ˈkɪlɚ/ noun A2
  1. One who or that which kills. (countable, uncountable) · There’s a killer on the loose.· My cat is a habitual bird killer.
  2. That which causes stress or is extremely difficult, especially that which may cause failure at a task. (countable, figuratively, uncountable) · That test was a killer.· The final hill in the race course was a killer.
  3. Something that is so far ahead of its competition that it effectively kills off that competition. (countable, figuratively, uncountable) · Digital streaming platforms are CD killers.
  4. The killer whale. (countable, uncountable)
  5. A remarkably impressive person or thing. (countable, figuratively, uncountable)
  6. A knockout form of darts or pool involving several players. (uncountable)
  7. A club used for killing fish. (countable, uncountable)
  8. A particularly heavy type of handstamp, or portion of one, often obscuring a large part of the postage stamp. (countable, uncountable)

Plural killers

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From the library

“They take orders from the Head of the Pack, and not from any striped cattle-killer.
The Jungle Book, p. 6 · B2
He shall live to run with the Pack and to hunt with the Pack; and in the end, look you, hunter of little naked cubs--frog-eater--fish-killer--he shall hunt thee!
The Jungle Book, p. 6 · B2
“This cattle-killer said he would kill me in the Council because he had not killed me when I was a cub.
The Jungle Book, p. 26 · B2
“Do you think a snake-killer kills muskrats?” said Rikki-tikki scornfully.
The Jungle Book, p. 73 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.