Put your oar in
What's the meaning of the phrase 'Put your oar in'?
To put your oar in is to interfere or get involved in an unwelcome way.
The expression is most commonly used in the UK and less so now than in the past.
What's the origin of the phrase 'Put your oar in'?
'Put your oar in' derives from an earlier variant of the phrase 'put (or have) an oar in another man's boat'. This earlier form was coined in the Tudor period and was quite a commonplace saying then.
It is a reasonable hypothesis that the expression was a form of Tudor innuendo. We can suppose that 'another's man's boat' referred to his wife. I'll leave what the oar might have alluded to to your imagination.
In eche mannes bote, would he haue an ore,
But no woorde, to good purpose, lesse or more.
The migration to 'put/stick your oar in' took place over some centuries. The 'oar in another man's boat' form continued to be used into the 18th century.