Del. Code tit. 28 § 1548
A player may substitute a gesture for a verbal statement of the player's action. The dealer must announce it, and the player must correct the dealer before any further action takes place. A player may verbally state an action as "check," "call," "raise," or "fold." If a player bets but announces a fold, the player has a dead hand. A statement by a player of "call" or "raise," "check" or "fold," or of a specific bet is binding. A player who states a certain amount but puts a different value of chips into the pot must correct the bets to the stated amount. The dealer must insure all bets are as stated by the player. Players, who make a bet, decide incorrectly that they have no live hand against the play, and fold their hand, lose the pot unless their hand is declared retrievable by the dealer.
28 Del. C. § 1548