jackknife

[ˈdʒæknaɪf]

jackknife Definition

• 1. a knife with a folding blade, or a dive in which the diver bends at the waist and touches their toes before straightening out again
• 2. to fold or bend something, especially a vehicle, in the middle

Using jackknife: Examples

Take a moment to familiarize yourself with how "jackknife" can be used in various situations through the following examples!

• Example

  He did a perfect jackknife off the diving board.

• Example

  The truck jackknifed on the icy road.

• Example

  She jackknifed the paper to fit it into the envelope.

jackknife Synonyms and Antonyms

Synonyms for jackknife

• dive
• fold
• bend
• crumple

Phrases with jackknife

• jackknife sofa

  a type of sofa that can be folded down to create a bed

  Example

  The RV came with a jackknife sofa for extra sleeping space.

• jackknife crunch

  an exercise that involves lying on your back and lifting your legs and upper body to meet in the middle

  Example

  She added jackknife crunches to her workout routine to strengthen her core.

• jackknife lock

  a type of lock used in trucks and trailers to prevent the trailer from moving

  Example

  The driver engaged the jackknife lock before leaving the truck unattended.

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Summary: jackknife in Brief

The term 'jackknife' [ˈdʒæknaɪf] refers to a folding knife or a dive in which the diver bends at the waist and touches their toes before straightening out again. It also means to fold or bend something, especially a vehicle, in the middle. The word is used in phrases like 'jackknife sofa,' 'jackknife crunch,' and 'jackknife lock.'