see the colour of someone's money

see the color of (one's) money

To view the money that one will pay with in order to verify that they have it. Sure I trust you—but I still want to see the color of your money so I know you're good for it.
See also: color, money, of, see

see the colour of someone's money

receive some evidence of forthcoming payment from a person.
See also: colour, money, of, see