see the colour of someone's money

US /siː ðə ˈkʌlər əv ˈsʌmˌwʌnz ˈmʌni/
UK /siː ðə ˈkʌlər əv ˈsʌmˌwʌnz ˈmʌni/
"see the colour of someone's money" picture
1.

金の色を見る, 確実な支払い能力を確認する

to make sure that someone actually has the money they claim to have before you do business with them

:
I won't sign the contract until I see the colour of your money.
あなたの金の色を見るまでは契約に署名しません。
The landlord wanted to see the colour of their money before agreeing to rent the apartment.
家主はアパートを貸すことに同意する前に、彼らの金の色を見たがった