Jackknife is the usual spelling for both the noun and the verb, but jack-knife is also seen.
- As he walked down the deserted country road, Juan Carlos found a brand-new jackknife.
- Transport trucks were jackknifed all over the highway after the tornado.
The plural is jackknives or jack-knives.
- The security officer took our jackknives from us as we got on the airplane in Regina.
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