put one's oar in, to

put one's oar in

 and 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.
See also: oar, put
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

put one's oar in

Interfere with something or insert one's opinion, as in I'll thank you not to put your oar in when we're discussing a private matter. This term, referring to helping to row a boat, was first recorded in Charles Coffey's 1731 play The Devil to Pay: "I will govern my own house without your putting in an oar."
See also: oar, put
The American Heritage® Dictionary of Idioms by Christine Ammer.

put one's oar in, to

To insert one’s opinion; to interfere in someone else’s business. This term, with its analogy to contributing one’s efforts to rowing a boat, dates from the late sixteenth century. Charles Coffey used it in his play The Devil to Pay (1731): “I will govern my own house without your putting in an oar” (1:2).
See also: oar, put
The Dictionary of Clichés by Christine Ammer
See also:
  • put (one's) oar in(to) (something)
  • put oar in
  • put one's oar in
  • put your oar in (something)
  • put/stick your oar in
  • at (one's) doorstep
  • at doorstep
  • at expense
  • at somebody's expense
  • at (one's) expense