What is "yardarms"

Usage examples of "yardarms".

The great yardarms which normally held up the sails doubled as derricks.

Hornblower found foothold on the bulwark through the netting, swaying perilously, leaning far out over the water, for the nettings were rigged from the yardarms and sloped sharply outwards.

Then lines from the yardarms and bowsprit end had to be rove through the upper edges.