じゃないか
じゃ無いか
ja naika

Expression

1. isn't it?

Usually Written in Kana
あしたあめるんじゃないかと心配しんぱいだ。
ashita amega furu njanaikato shimpaida.
I'm afraid it will rain tomorrow.
Expression

2. let's ...; why don't we ...; how about we ...; shouldn't we ...

Usually Written in Kana
あらかじめ準備じゅんびしておこうじゃないか。
arakajime jumbi shite okōjanaika.
Let's get things ready beforehand.