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Jackknife (Noun)

A large knife with one or more folding blades.

Nouns denoting man-made objects.

The old outdoorsman always carried a trusty jackknife with him for various tasks on his wilderness adventures.
He carefully unfolded the blade of the jackknife to cut the rope that had become tangled in the rocks.
My grandfather passed down his antique jackknife to me as a family heirloom before he passed away.
She pulled out a small jackknife from her backpack and used it to cut a piece of cloth for a makeshift bandage.
The pocket-sized jackknife had been his constant companion since he was a young boy scouting in the woods.

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

Nouns denoting acts or actions.

The gymnast perfectly executed a jackknife off the springboard during the diving competition.
She attempted the jackknife but faltered mid-dive due to a lack of practice.
Jackknives require precise technique to be performed safely and effectively.
After months of training, the young diver finally mastered the complex jackknife maneuver.
The crowd gasped in awe as the diver executed a flawless jackknife off the high platform.