give somebody a hand
lend somebody a hand

"I could come by after work and give you a hand with your little project."

We can do so much more when given a free hand.

Could you come up here and give me a hand.

And I rather think he'll want the police to give him a free hand.

And everybody would give her a big hand, if you ask me.

I think we should go and give him a hand.

Do you come down now to give me a hand.

Let's give you a hand in making up your mind.

Some of their friends gave them a hand up the side.

I'm going to have to get back to rest now, though, if your friend here will give me a hand.