Ante up is a common phrase used in poker that refers to the act of contributing money to the pot before a game begins. The antonyms for the word "ante up" include words like withhold, withdraw, refrain, retain, and hoard. These words describe the opposite of giving money and instead suggest keeping it for oneself. In the context of poker, refusing to "ante up" would mean not participating in the game or refusing to make a contribution to the pot. Antonyms of "ante up" are particularly useful in situations where someone wants to indicate their unwillingness to contribute or wants to express their lack of interest in participating in a given project or activity.