stick one's oar in
Definition from Wiktionary, the free dictionary
- (idiomatic, UK) To meddle; to stick one's nose into (something)
- I don't want her coming and sticking her oar in - she doesn't know anything about our financials.
- "He feels he must be [there] today. Not to stick his oar in, you understand, but to offer moral support." - Daily Mail, August 2005