To engage in a wager or to make a stake.

दांव लगाना

English Usage: I bet that it will rain tomorrow.

Hindi Usage: मैं दांव लगाता हूँ कि कल बारिश होगी।

A wager or stake on the outcome of an event.

दांव

English Usage: He placed a bet on the horse racing event.

Hindi Usage: उसने घोड़ों की दौड़ पर एक दांव लगाया।