buoy
n.n. a floating object that helps ships stay on course or warns them of danger. It can also be a small island or a person who keeps someone's spirits up.
n. a floating object used to mark a position on water, provide a safe anchorage, or warn of hazards. In a figurative sense, it refers to a person who provides emotional support or a small island.
The ship followed the red buoy to the harbor.
The lighthouse keeper maintained several buoys to guide the vessels safely through the rocky coastline.
While the physical buoys were essential for navigation, the crew relied on the buoy of their captain's steady leadership to maintain morale during the storm.
From Middle English boy, boye, from Middle Dutch boeye (“float, buoy”), from Old French boue (“piece of wood or cork that floats above an anchor to indicate where it is anchored”) (modern French bouée), ultimately from Frankish *baukn (“beacon”). Doublet of beacon. Same root as English bon in bonfire. Alternatively, and perhaps less likely (due to the unexplained shift in meaning), from Middle Dutch boeye (“shackle, fetter”), from Old French buie (“fetter, chain”), from Latin boia (“a (leather) collar, band, fetter”), from Ancient Greek βόεος (bóeos), βόειος (bóeios, “of ox-hide”), from βοῦς (boûs, “ox”), from Proto-Indo-European *gʷṓws (“cow”). Noun sense 2 was coined by American linguist Scott K. Lindell in 2003.