By the way, as a follow-up to Rosie's question a while back, googling the phrase on the card does turn up one figurative use, and there may be others. But the one that shows up on a google search is pretty arcane (I'd never heard of it, and I would have been more likely to have come across it than most people here). So I don't think hunting for the figurative use will get you anywhere.

Eh? No.

Linguisticky? No.

(I don't think this one is inherently terribly difficult. It's just no one has yet come up with a question that unlocks it in any real way. And no, that's not a clue.)