put your oar in (something)
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.
put your oar in (something)or
stick your oar in (something)mainly BRITISH, INFORMAL
If someone puts their oar in or sticks their oar in, they interfere in a situation or an argument. He let them say what they wanted to say without feeling the need to put his oar in; he is obviously a good listener. He should try to sort out his own affairs instead of sticking his oar in other people's business. Note: This comes from an old expression `to have an oar in every man's boat', meaning to interfere in other people's business.