gamble on something
phrasal verb with gamble verb uk/ˈɡæm.bəl/ us/ˈɡæm.bəl/
UK冒…的风险;碰…的运气
to take a risk that something will happen
You're rather gambling on it being a nice day by holding the party in the garden, aren't you? 在花园里开露天聚会，那你把宝全押在肯定是个好天气上了，是不是？