break in is a verb meaning "enter someone's (virtual or real) property in an unauthorized manner, usually with the intent to steal or commit a violent act". It carries 6 recorded senses.
break into a conversation
“her husband always chimes in, even when he is not involved in the conversation”
start in a certain activity, enterprise, or role
make submissive, obedient, or useful
“The horse was tough to break”
“I broke in the new intern”
Definitions, synonyms and semantic relations for break in come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.