I'll be damned if I (do something)

I will not let something happen.

I'll be damned if I let her tell me that I don't belong here.

• be no match for something
• be none the wiser
• be no oil painting
• be no picnic
• be no spring chicken
• be nothing much to write home about
• be nothing short of
• be nothing short of astonishing
• be nothing short of [astonishing/miraculous etc.]
• be nothing short of miraculous
• be nothing to shout about
• be nothing to sneeze at
• be nothing to sniff at
• be no use to man or beast
• bent on
• bent on something
• bent out of shape
• be of a piece
• be off base
• be off beam
• be off chump
• be off-colour
• be off nut
• be off rocker
• be off the beaten track