
1) Bad news for a big rig 2) Bodyweight exercise 3) Certain dive 4) Clasp knife 5) Dive 6) Dive of a sort 7) Diving maneuver 8) High-dive move 9) Large pocket blade 10) Pocket knife 11) Pocketknife 12) Pool site feat 13) Semi hazard 14) Serious accident 15) Tough dive 16) Weapon for Benny
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https://www.crosswordclues.com/clue/jackknife

1) Dive 2) Jockteleg
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https://www.crosswordclues.com/clue/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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A jackknife, or pocket knife, is a compact, foldable knife. Jackknife may also refer to: == See also == ...
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http://en.wikipedia.org/wiki/Jackknife
[exercise] A jackknife is an abdominal exercise. Jackknife exercises are designed to work the abdominal muscles, particularly the lower abs. There are a number of variations of jackknife exercises that allow people of different ages and ability to work their abdominal muscles.The jackknife can be done on an exercise ball, exercise bench, th...
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http://en.wikipedia.org/wiki/Jackknife_(exercise)

• (n.) A large, strong clasp knife for the pocket; a pocket knife.
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http://thinkexist.com/dictionary/meaning/jackknife/
Jack'knife` noun A large, strong clasp knife for the pocket; a pocket knife.
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http://www.encyclo.co.uk/webster/J/1

A jackknife or jack knife, is a large pocket knife with a folding blade (a clasp-knife).
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http://www.probertencyclopaedia.com/browse/FJ.HTM

[
n] - a dive in which the diver bends to touch the ankles before straightening out 2. [v] - dive into the water bending the body at the waist at a right angle, like a jackknife
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http://www.webdictionary.co.uk/definition.php?query=jackknife
noun a dive in which the diver bends to touch the ankles before straightening out
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https://www.encyclo.co.uk/local/20974

The point at which the cab of an articulated lorry is overtaken by the trailer its pulling while still attached.
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https://www.encyclo.co.uk/local/22335
No exact match found.