so help me (God)
used when making a serious promise, especially in a court of law

[TahlilGaran] Dictionary of Contemporary English ▲

so help me
so help me (God)
this is the truth.
That was one of the most frightening sights of my life, so help me.

You look at me when I'm talking to you or, so help me God, I'll hit you.

Usage notes: used for very strong emphasis, as in the examples

[TahlilGaran] English Idioms Dictionary ▲

so help me
I promise, I swear
"So help me, if you do not pay me back my money I will phone your company and tell them."

[TahlilGaran] English Idioms Dictionary ▲

so help me
interj., informal I promise; I swear; may I be punished if I lie.
I've told you the truth, so help me.
So help me, there was nothing else I could do.

[TahlilGaran] English Idioms Dictionary ▲