gamble on (?.)

• aller sans dire
• bank on
• be axiomatic
• be certain
• be confident
• bet on
• calculate on
• chance
• chance it
• count on
• depend on
• doubt not
• feel sure
• go without saying
• have no doubt
• hazard
• just know
• know
• know for certain
• lean on
• place reliance on
• reckon on
• rely on
• rely on fortune
• rely upon
• repose on
• rest assured
• rest on
• risk
• run a chance
• run the risk
• set at hazard
• swear by
• take a chance
• take a flier
• take chances
• tempt fortune
• trust to
• trust to chance
• try the chance
• venture
• wager