To come between so as to be hindrance or obstacle

To encroach on the rights of others, as in trading without a proper license.

To meddle impertinently and officiously and usually so as to interfere

ETYM latin inter between + venire to come.
To get involved, usually so as to hinder or halt an action; SYN. step in, interfere, interpose.

(Homonym: medal).
To intrude in other people's affairs or business; interfere unwantedly; SYN. tamper.

To get involved or mixed-up with