in for an inch, in for a mile
in for a penny, in for a pound BrE
in for a dime, in for a dollar AmE

In for a penny in for a pound, I took the job.

At that first preview all three of us were 'in for a penny in for a pound' but it just went like fire.

Let's just say in for a penny in for a pound, or, if you like, a calculated risk.

In for a penny in for a pound; she bought the sunshade, and the whole structure was at last complete.

But in for a penny in for a pound, as they say, and we've reached a moment where somebody who can handle it needs to use the position to effect some good.

Whether or not the SSEEP idea was a good one was very hard for her to judge, but in for a penny in for a pound; and she figured that as an experiment it would give some results, one way or another.

The next night the guy turns up again and after showing her plenty of attention throughout the night he asks if she will sleep with him again for $200.She figures in for a penny in for a pound - and it was fantastic the night before - so she agrees.