back·stay /-ˌste/
後部撐物
Back·stay n.
1. Naut. A rope or stay extending from the masthead to the side of a ship, slanting a little aft, to assist the shrouds in supporting the mast. [Often used in the plural.]
2. A rope or strap used to prevent excessive forward motion.
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backstay
n : a stay that supports the back of something