This idiom or expression has to do with:

Accepting.
Understanding and accepting a somewhat difficult situation.

It’s not easy, but I've been trying to come to terms with my father’s past.

Also:
Coming to grips.

This idiom or expression has to do with:

Accepting it.
Not objecting to it.
Not making a big deal about it.

Q. What did he say when you told him that we knew about his trip?
A. He didn’t make any bones about it. He admitted it.