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Definition of Just in case
1. Adverb. If there happens to be need. "I have money, just in case"
Exact synonyms: In Case
Definition of Just in case
1. Adverb. (idiomatic) In the event; should there be a need. ¹
2. Adverb. (logic) if and only if ¹
¹ Source: wiktionary.com