To stay or remain in a place, or in nautical usage, to support with stays (the ropes or wires that brace a mast).
From 'be-' prefix plus 'stay,' where 'stay' has multiple origins—as a verb meaning to remain (from Old French), and as a noun (rope on a ship) from Old Norse 'stag.'
Nautical vocabulary reveals how practical problems create precise language—a ship's 'stays' are literally what keep the mast from toppling, and calling them by name reminds sailors that these ropes are life and death at sea.
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