put oar in
put one's oar inand stick one's oar in; put one's two cents(' worth) in
Fig. to add one's comments or opinion, even if unwanted or unasked for. You don't need to put your oar in. I don't need your advice. I'm sorry. I shouldn't have stuck my oar in when you were arguing with your wife. Do you mind if I put in my oar? I have a suggestion. There is no need for you to put in your two cents' worth.
put/stick your oar in(British & Australian informal)
to involve yourself in a discussion or a situation when other people do not want you to I don't want Janet coming to the meeting and sticking her oar in - she knows nothing about the situation.