Meaning of BREAK-IN in English

BREAK-IN

noun Date: 1856 the act or action of breaking in , a performance or a series of performances serving as a trial run, an initial period of operation during which working parts begin to function efficiently

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.