Breadcrumb Home > Thesaurus > J Synonyms of jackknife Find synonyms for: Noun 1. clasp knife, jackknife, pocketknife, pocket knife usage: a large knife with one or more folding blades 2. jackknife, dive, diving usage: a dive in which the diver bends to touch the ankles before straightening out Verb 1. jackknife, dive usage: dive into the water bending the body at the waist at a right angle, like a jackknife WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of jackknife (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: hagiography Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language