break-in
UK: /ˈbreɪk.ɪn/ | US: /ˈbreɪk.ɪn/
n. an illegal entry into a building or vehicle, typically to steal something
n. a period of adjustment or initial use (e.g., for machinery)
n. (sports) a successful penetration of a defensive line
The word "break-in" combines "break," from Old English brecan (to shatter or violate), and "in," from Old English inn (inside). Originally literal (forcing entry), it evolved to include metaphorical uses like "adjustment periods" (e.g., breaking in shoes) and sports terminology. The compound reflects physical intrusion followed by adaptation.
The police reported a break-in at the jewelry store last night.
New employees need a break-in period to learn the system.
The athlete’s quick break-in surprised the opposing team.
Always check locks to prevent potential break-ins.
The car’s engine performs better after a proper break-in.