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Wiktionary
break into

vb. 1 (context transitive idiomatic English) To enter illegally or by force, especially in order to commit a crime. 2 (context transitive idiomatic English) To open or begin to use. 3 (context transitive idiomatic English) To successfully enter a profession or business. 4 (context transitive English) To begin suddenly.

WordNet
break into
  1. v. express or utter spontaneously; "break into a yodel"; "break into a song"; "break into tears"

  2. change pace; "The dancers broke into a cha-cha"; "The horse broke into a gallop"

Usage examples of "break into".

Maybe break into the fat man's legendary database of informers, whores, and drinking buddies, and create a little mischief.

On the other hand, a mad rush to break into the alien ship might equally guarantee hostility from its inhabitants.