Wiktionary
muscle in on
vb. (context transitive English) to interfere with, or intrude on something forcibly
Usage examples of "muscle in on".
If the little scaly devil thought to muscle in on his operation, he'd get a surprise.
If the little scaly devil thought to muscle in on his operation, he’.
Johnny Marcone's thugs were shooting it out with some of the Jamaican gang that was trying to muscle in on the territory back then.
There wasn't a man voting for it who didn't think that under a setup of this kind he'd muscle in on the profits of the men abler than himself.
Everything had been running along well until Gris tried to muscle in on the PR business.