IPA: //ˈɡræp.laɪn//
KK: /ˈgræplaɪn/
A type of hook used in nautical contexts, similar to a grapnel, for grabbing or holding onto objects in water.
The fisherman used a grapline to secure his boat to the dock.
The word 'grapline' originates from Middle English 'graplyn', which is derived from the Old French 'grapelin', meaning a small hook or clasp. It refers to a small device used for grasping or holding something.
Think of a small 'hook' or 'clasp' that helps you 'grasp' something securely — that's what a grapline is.