In Case (conjunction / idiom) — في حال: As a precaution against something that might happen. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
As a spare for a need that may never come — just-in-case names a backup you keep in reserve, not a just-for-kicks joke and not a plan you can already justify.
lestas a precautionfor safetyif need beto be safeas a safeguardagainst the chance that
In case something unlikely turns out to be true.
Expressing a choice or doubt.