IPA: /ˈtɒpˌmæst/
KK: /ˈtɑpˌmæst/
The highest part of a ship's mast, located above the lower mast and below the topgallant mast, used for supporting sails.
The sailor climbed to the top of the topmast to adjust the sails.
**Topmast** → The word is formed from "top" (from Old English *top*, meaning the highest part) and "mast" (from Old English *masta*, meaning a pole or post). A topmast refers to the highest mast on a ship, indicating its position at the top of the mast structure.
Think of the 'highest part' ('top') of a 'pole' ('mast') on a ship — that's what a topmast is.