a safe bet

US /ə seɪf bet/
UK /ə seɪf bet/
"a safe bet" picture
1.

確実なこと, 安全な賭け

something that is certain to happen or to be successful

:
It's a safe bet that the new restaurant will be popular.
新しいレストランが人気になるのは確実だ
Given his track record, he's a safe bet for the promotion.
彼の実績を考えると、昇進は確実だ