noun (plural jackknives)
- 1A large knife with a folding blade.More example sentences
- Adam had chosen a jackknife rather than a fixed blade.
- With a jackknife, he whittled a point on a thin green stick pulled from a maple branch.
- Pen clips, protractors, and jackknives have left hacked shapes to tell people how dull it all was when they sat here.
- 2A dive in which the body is first bent at the waist and then straightened.More example sentences
- But still, I usually like to lounge about in a chaise lounge or something while everyone else is doing cannonballs and jackknives and freakish flips off the diving board.
- Though his past leaps of faith have had about as much grace as a jackknife into a leaf-covered pool, bringing Gibbs back has ‘reverse pike triple somersault’ written all over it.
- With his opponent flat in the center of the ring, Van Dam climbs to the top turnbuckle, springs across the ring crouching and extending his torso like a diver performing a jackknife.
- 3 Statistics A method of assessing the variability of data by repeating a calculation on the sets of data obtained by removing one value from the complete set.More example sentences
- To evaluate clade support, bootstrap and jackknife analyses were performed in PAUP * using a full heuristic search with 1000 replicates, simple addition sequence, and TBR branch-swapping.
- Bootstrap and jackknife analyses were performed under the MP criterion, with equal weights for all positions and two random additions of sequences for 200 replicate searches.
- Higher-order jackknife estimates lead to successively greater reductions in the bias of the estimates of N d, but at the cost of increasing sampling variance.
verb (jackknifes, jackknifing, jackknifed)[no object] Back to top
- 1Move one’s body into a bent or doubled-up position: she jackknifed into a sitting positionMore example sentences
- With a harsh indrawn breath, I jackknife to a sitting position.
- Students then jackknife their legs even closer to their bodies to the rhythm of a driving beat.
- Jimjim's body suddenly jackknifed, wrenching his figure to the side.
- 1.1(Of an articulated vehicle) bend into a V-shape in an uncontrolled skidding movement: the accident happened when a lorry jackknifedMore example sentences
- Mr William tried to slow down by pumping his brakes but the vehicle jackknifed in the road while trying to avoid Mr Utting.
- The snow came down in handfuls and cars jackknifed to the left and right of us as we drove east on unplowed streets.
- A double-semi had jackknifed, neatly shutting down four lanes.
More definitions of jackknifeDefinition of jackknife in:
- The US English dictionary