(not) have a leg to stand on

to be in a situation where you cannot prove something.

The problem is, if you don't have a witness, you don't have a leg to stand on.

I haven't even got the receipt to prove where I bought it, so I don't have a leg to stand on.

• 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
• be off the blocks
• be off the hook
• be off the mark
• be off the starting blocks
• be off the wall