Word Forms of "jackknife" (5 forms)

Noun

Form	Word
Plural	jackknives

Pluraljackknives

Verb

Form	Word
Participle, Past	jackknifed
Participle, Present	jackknifing
Past	jackknifed
Present, Singular, Third-Person	jackknifes

Participle, Pastjackknifed

Participle, Presentjackknifing

Pastjackknifed

Present, Singular, Third-Personjackknifes

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.