Muscle in
Definition 1 of 1
Pro Tip 1/3Unwelcome Involvement
Use 'muscle in' to express unwelcome participation or interference in a situation. 
He tried to muscle in on the project, but the team wasn't having it.
Pro Tip 2/3Forceful Entry
'Muscle in' suggests using strength or power to insert oneself into a situation. 
Despite their objections, she muscled in and took control of the meeting.
Pro Tip 3/3Social Nuance
Consider the social context, as 'muscle in' can imply rude or aggressive behavior. 
At the party, Mark just muscled in on our group, dominating the conversation.