Jackknife definitions

jăk'nīf'
A large clasp knife.
noun
63
2
A dive in the pike position, in which the diver straightens out to enter the water hands first.
noun
60
1
To fold or double (something or oneself) like a jackknife.
verb
57
1
A large pocketknife.
noun
57
1
A dive in which the diver keeps his knees unbent, touches his feet with his hands, and then straightens out just before plunging into the water.
noun
54
0
To cut or stab with a jackknife.
verb
54
1
To bend or fold up like a jackknife.

A truck that had jackknifed was blocking the road.

verb
51
0
To bend at the middle as in a jackknife dive.
verb
51
0
To form a 90° angle.
verb
48
1
To turn on its hitch so as to form a sharp angle.
verb
48
1
To cut with a jackknife.
verb
45
1
To cause to jackknife.
verb
42
0
Alternative spelling of jack-knife.
noun
0
0
(statistics) 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.
noun
0
0
Alternative spelling of jack-knife.
verb
0
0