Deadun, a horse which will not run or will not try in a race, and against which money may be betted with safety.
The early Greeks betted, as we find in Homers Iliad, b. xxiii.
More and more Mr. Will betted with him, and wanted to sell him bargains.
This feat Cobham had betted a guinea that he would accomplish.
We were told that 'blood' may always be betted on to win the race; blood that is blue will beat the red hollow.
Some one betted the priest that he would not bring an owl into his sermon.
The king promptly accepted the rash wager, and betted the forest of Pentland Moor.
Numerous spectators were present to witness the trial, and betted on the feat.
"I might have betted after all, and been quite safe," she said.
If you was to say I betted now you'd say what wasn't true, wouldn't you?
1590s, as both a verb and noun, in the argot of petty criminals, of unknown origin; probably a shortening of abet or else from obsolete beet "to make good," from Old English bætan "make better, arouse, stimulate," from Proto-Germanic *baitjanan, in which case the verb would be the original. The original notion is perhaps "to improve" a contest by wagering on it, or it is from the "bait" sense in abet. Used since 1852 in various American English slang assertions (cf. you bet "be assured," 1857). Related: Betting.