Etymology
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bitt (n.)

nautical, "strong post to which cables are made fast" (usually in plural, bitts), 1590s, of uncertain origin; compare Old Norse biti "crossbeam." Probably somehow related to bit (n.1).

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Definitions of bitt
1
bitt (v.)
secure with a bitt;
bitt the ship line
2
bitt (n.)
a strong post (as on a wharf or quay or ship for attaching mooring lines);
Synonyms: bollard
From wordnet.princeton.edu