Definitions:

1. to break into a conversation verb
   • Stop breaking in and let us finish.
2. to break so as to fall inward verb
   • The shot broke in.
3. to enter someone's property in an unauthorized manner, usually with the intent to steal or commit a violent act verb
   • The burglars planned the break in carefully.
4. to intrude on uninvited verb
   • They planned to break in and steal money.
5. to make submissive, obedient, or useful verb
   • We need to break in your new baseball glove.
6. to start in a certain activity, enterprise, or role verb
   • I'm trying to break in to my new career.

Synonyms:

• break
• put in