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Webster 1913 Edition

Noun.

(Naut.)

A large rope to fasten the midship part of a ship to a wharf, or to another vessel.

Noun.

[breast and fast.] A large rope to confine a ship sidewise to a wharf or key.

breastfast ‎(plural breastfasts)

(nautical) A large rope to fasten the midship part of a ship to a wharf or to another vessel.