Jackknife
/ˈdʒæknaɪf/
Definition 1 of 3
Pro Tip 1/2Tool Usage
Jackknife often relates to outdoor activities or handy tasks for convenience. 
She pulled out her jackknife to whittle a stick at the campsite.
Pro Tip 2/2Portable Item
A jackknife is small, foldable, and easily carried, emphasizing portability. 
Before the hike, he ensured his jackknife was in his backpack. Compare with
CutlassDaggerDirkMachetePenknifeStilettoSwitchblade
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