noun. A large clasp knife.

noun. A dive in the pike position, in which the diver straightens out to enter the water hands first.

intransitive verb. To fold or double (something or oneself) like a jackknife.

intransitive verb. To cut or stab with a jackknife.

intransitive verb. To bend or fold up like a jackknife.

intransitive verb. To form a 90° angle.

noun. A pocket-knife larger than a penknife.

noun. A horn-handled clasp-knife with a laniard, worn by seamen.

noun. A form of terminal used for making connections in central telephone-stations. See jack, 11 .

noun. A large, strong clasp knife for the pocket; a pocket knife.

noun. Alternative spelling of jack-knife.

noun. A resampling method that applies estimators to all subsamples that each omit a single different group (possibly of a single datapoint) of the original sample to provide a sample distribution of the estimate.

verb. Alternative spelling of jack-knife.

verb. dive into the water bending the body at the waist at a right angle, like a jackknife

noun. a large knife with one or more folding blades

noun. a dive in which the diver bends to touch the ankles before straightening out

"To rephrase Steve McIntyre if he will forgive me the jackknife is the statistical technique of resampling by running the estimate on subsamples of N-q from a sample of N then averaging the results."

jack-knife carpenter  jack-knife gull  

dive  diving  pocketknife  

bath-house  boat hook  branchial  burin  cabin-door  

adz  ax  belly buster  belly flop  belly whopper  

jackknives  

jackknifed  jackknifes  jackknifing