put/stick your oar in
put (one's) oar in(to) (something)
1. To offer or express one's opinion (on some matter), even though it was not asked for or desired. I don't know why you feel you have to put your oar into every dispute Terry and I are having. The members of the board are perfectly capable of arriving at a decision of their own accord, so I'll thank you for not putting your oar in, Tom.
2. To involve oneself in an intrusive or nosy manner into something that is not one's business or responsibility. I wish my neighbors would quit putting their oars in and just leave us alone! Liam, don't put your oar into your brother's affairs—he can manage well enough on his own.
stick (or poke or put or shove) your oar ingive 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.