Bets that are "live" (i.e., can be resolved with the next roll) are said to be working. Generally, place bets, buy/lay bets, and come odds bets do not work on the come-out unless you tell the dealers to "make them work." All other bets (e.g., hardways) work unless you call them "off" (i.e., tell the dealers you do not want them to "work").
A term used to imply that a bet is in full force and effect, even though the entire table may not be in effect at the time. Reverse is not working, which implies that for a given period of time the bet is not in full force and effect.
When a coal seam is being squeezed by pressure from roof and floor, it emits creaking noises and is said to be "working". This often serves as a warning to the miners that additional support is needed.