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That which causes stress or is extremely difficult, especially that which may cause failure at a task.
"That test was a killer."
Something that is so far ahead of its competition that it effectively kills off that competition.
"Digital streaming platforms are CD killers."
A knockout form of darts or pool involving several players.
Distressing, uncomfortable.
"I had a killer headache this morning."
A sea mammal related to dolphins and porpoises (Orcinus orca).