pay (someone) on the nail(redirected from paying them on the nail)
pay (someone) on the nail
To pay (someone) immediately, on the spot, or without delay. Primarily heard in UK. I could put the bill on my credit card, but if it's all right with you, I'd rather we divvy it up here and pay on the nail. My lodger is a bit of a noisy fellow, but so long as he keeps paying me his rent on the nail, I don't mind.