put your oar in BrE informal
stick your oar in BrE informal
get your oar in BrE informal

She was talking to me just now, before you put your oar in.

When I fail it'll be time enough to put your oar in."

"You know nothing about it, Emerson, so kindly refrain from putting your oar in."

Lady, put your oars in the water."

Put Your Oar In If you want to give competitive indoor rowing a go, start training.

"If you're paddling a canoe from the rear and want to point the bow to the left, you put your oar in the water on the left," he said.

Cast out the rowing machine that sits gathering dust in your bedroom, put your oar in and the real thing - you don't have to be an undergraduate at Oxbridge.

Now that we know it's him, you need to stick your oar in, Andrew.

"This squadron was doing fine until you stuck your oar in."

We were sorting it out quite nicely until you stuck your oar in.

You can't stick your oar in like that to her at any old time can you, really?

"Maybe she did nae want you and your brother sticking your oar in again," Archie retorted.

"You got your oar in the water quickly."