in case

Preposition

 Prepositionin case
1. If you do ${\displaystyle x}$ in case of ${\displaystyle y}$, you do ${\displaystyle x}$ because it would be bad if you didn't do it and ${\displaystyle y}$ happened.
Let's check again in case we missed something.
You should bring a coat in case of snow.
You should be ready just in case.
2. if
What will happen in case she doesn't come?