IPA: /ˈseɪlklɔːθ/
KK: /ˈseɪlˌklɔθ/
A strong fabric made from cotton or synthetic materials, used primarily for making sails, tents, or other outdoor items.
The boat's sails were made of durable sailcloth that could withstand strong winds.
Sailcloth → The word is formed from "sail" (from Old English *sægl*, meaning a piece of fabric used to catch wind) and "cloth" (from Old English *clāþ*, meaning a woven fabric). Together, these parts describe a type of fabric specifically used for making sails.
Think of a 'piece of fabric' ('cloth') that is used to 'catch wind' ('sail') — that's what sailcloth is.