• A large clasp knife.
  • A dive in the pike position, in which the diver straightens out to enter the water hands first.
  • To fold or double (something or oneself) like a jackknife.
  • To cut or stab with a jackknife.
  • To bend or fold up like a jackknife.
  • To form a 90° angle.
  • A pocket-knife larger than a penknife.
  • A horn-handled clasp-knife with a laniard, worn by seamen.
  • A form of terminal used for making connections in central telephone-stations. See <internalXref urlencoded="jack">jack</internalXref>, 11 .
  • A large, strong clasp knife for the pocket; a pocket knife.
  • Alternative spelling of <xref>jack-knife</xref>.
  • A <xref>resampling</xref> method that applies <xref>estimators</xref> 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.
  • Alternative spelling of <xref>jack-knife</xref>.
  • dive into the water bending the body at the waist at a right angle, like a jackknife
  • a large knife with one or more folding blades
  • a dive in which the diver bends to touch the ankles before straightening out
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