The word
"yardarm" refers to the horizontal beam on a sailing ship's mast, extending from the mast to the outer edge. It's used to support and control the ship's sails.
Full definition
The hills of a desert, where the trio crashes after flying through a thunderstorm, become the towering waves of the high seas, and a clash of ships results in one swinging like a pendulum from
the yardarm of the other.
As spectators streamed toward the town square, someone lobbed a rope over
the yardarm of a telephone pole and hoisted Edwards's limp body skyward.
While I was helplessly attached to
a yardarm by fifty feet of rope three enemies where firing at me - including one armed with an RPG - and yet I was never really ever in any mortal danger.