In casino and betting slang, a dime is $1,000. The word normally names the US ten-cent coin, which is exactly why newcomers get confused when a player says they “put a dime on red”. Gamblers favour codes like this because they keep table talk short and discreet, and the term is heard in land-based casinos, card rooms and around sports betting.
A smaller group of players uses dime to mean $100 instead. The usage is rare, but it is a good reason to say the exact amount whenever real money is involved, especially before a bet is confirmed. The related term dime bet describes the $1,000 wager itself.
Slang in VIP service
High-stakes players often use this kind of shorthand with hosts and account managers. Support and VIP teams should confirm stakes and limits in figures, not slang, so there is never a dispute about what was agreed.