With all (one's) might phrase
With every possible power that one can generate.
Some people claim that even when they push with all their might, they can't do a single push-up.
He punched the wooden door with all his might to destroy it but ended up breaking his hands.
This stone is so heavy. I lifted it with all my might, but it far from moved.
The origin of this phrase is not clear.
Be very nearly or inevitably lost, departed or deceased
He is in terminal cancer so I’m afraid he is as good as gone.