jackknife

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

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

A._), large pointed jackknife used by seamen. — The Spanish American Reader, Ernesto Nelson
Their fore legs can shut up like a jackknife. — The Insect Folk, Morley, Margaret Warner
A broadshouldered student with a moustache was cutting in the letters with a jackknife, seriously. — A Portrait of the Artist as a Young Man, James Joyce

clasp knife

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