transitive verb
1. : to proceed or pass into or turn to with or as if with a sudden throwing off of restraint
he broke into swearing
his opponents broke into bitter criticism
the horses broke into a gallop
2. : to make entry or entrance into : overcome resistance or exclusiveness in order to become a part, member, or contributor of
romantic girls trying to break into the movies
breaking into elite social circles
3. : interrupt
breaking into the radio play with an important news bulletin
4. : to force (a code or cipher) to yield the first of its secrets after which success in breaking must follow