IPA: /ˈtaɪˌbreɪkər/
KK: /ˈtaɪˌbreɪkər/
A method or extra round used to determine a winner when two or more competitors have the same score or result.
The match ended in a tie, so they had to play a tiebreaker to find the winner.
Tiebreaker → It is formed from "tie" (from Old English *tīgan*, meaning to fasten or bind) and "breaker" (from "break" which comes from Old English *brecan*, meaning to separate or shatter). A tiebreaker is something that separates or resolves a tie, thus breaking the equal status of two competitors.
Think of a situation where two competitors are 'bound' together ('tie') and need something to 'separate' them ('breaker') — that's what a tiebreaker does.