Definition of jackline in English:

jackline

noun

  • 1Any of various kinds of (thin) rope or line used for a particular purpose, (now) especially in sailing.

  • 2Nautical
    A rope, wire, etc., running along the length of a ship's deck and secured at both ends, to which a crew member's safety harness is clipped so that he or she can move about the deck safely in rough weather, conditions of poor visibility, etc.

Origin

Early 17th century. From Jack + line.

Pronunciation

jackline

/ˈdʒaklʌɪn/