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The Collaborative International Dictionary
rattlings

Ratlines \Rat"lines\, Ratlins \Rat"lins\ (r[a^]t"l[i^]nz), n. pl. [Of uncertain origin.] (Naut.) The small transverse ropes attached to the shrouds and forming the steps of a rope ladder. [Written also ratlings, and rattlings.]
--Totten.

Wiktionary
rattlings

n. (context nautical English) ratlines