1.VerbTo enter illegally or by force, especially in order to commit a crime.
"Somebody broke into his car and stole his tools and CDs.; Hackers broke into the bank's computer system and stole customer data.; His house was broken into only last week."
2.VerbTo open or begin to use.
"I finally broke into the second package of cookies."
3.VerbTo successfully enter a profession or business.
"He hopes to break into show business."
4.VerbTo begin suddenly.
"The horse broke into a gallop as they neared the barn.; I just broke into tears while talking to my mom.; She broke into a smile, wrenching herself away from our head physician."