What is to stake or pledge upon the event of a contingent issue; to wager. John a Gaunt loved him well, and betted much money on his head. Shak. I'll bet you two to one I'll make him do it. O. W. Holmes called?

bet — To stake or pledge upon the event of a contingent issue; to wager. John a Gaunt loved him well, and betted much money on his head. Shak. I'll bet you two to one I'll make him do it. O. W. Holmes. (Webster's 1913.)

Sources