Killer instinct

Meaning

A ruthless focus that secures a win.

Usage

Used to praise decisive competitors or leaders.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Sports commentators described ruthless finishing moves as killer instinct.

Phrase became popular in mid-20th-century sports and business talk.