grappling iron - definition and synonyms

noun [countable] 

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/ˈɡræp(ə)lɪŋ ˌaɪə(r)n/
singulargrappling iron
pluralgrappling irons
singulargrappling hook
pluralgrappling hooks

or grappling hook 

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  1. an iron object with hooks that you tie to the end of a rope and use for holding the rope in place