fail ****
go wrong **
miscarry

Even I might have gone wrong while he wasn't looking.

But I don't see why everything had to go wrong at once.

I asked, as if nothing in the world had gone wrong.

I don't know how everything could have gone so wrong!

What kind of things have gone wrong in the past.

But in the past year, something had gone wrong between them.

If something had gone wrong, he might need her help.

From the looks of him, he couldn't figure what had gone wrong.

Actually a lot of things had gone wrong during the recent year.

They could always come back if things went too wrong.