leave (something) on the table v. phr. to refrain from taking the utmost advantage of something; to not address every aspect of a situation; in the form leave money on the table, to negotiate a deal that is less financially beneficial than is expected or possible. (source: Double-Tongued Dictionary)
Further reading
Oofless is an antiquated bit of British slang that describes someone temporarily short on cash. It’s from ooftisch, a Yiddish-derived term for “cash placed on the table,” from German auf Tisch. This is part of a complete episode. Transcript of...
While reading Great Expectations (Bookshop|Amazon) by Charles Dickens, a listener in Arlington, Texas, is surprised when one of the characters inherits some money, which Dickens describes as a cool four thousand. Were they really using cool that way...