put/stick your oar in

stick (or poke or put or shove) your oar in

give an opinion or advice without being asked. informal
1992 Daily Telegraph My only minor fault is I sometimes like putting my oar in…and my advice can be a little brutal.
See also: oar, stick

put/stick your ˈoar in

(British English, informal) interfere in the affairs of other people: This project is nothing to do with Dave. Why does he keep trying to stick his oar in all the time?
See also: oar, put, stick