breast line

Noun

(nautical) A rope used to tie a small ship to a dock, keeping it close to the pier / A rope to which the pontoons of a military bridge are fastened

Japanese Meaning

小型船を桟橋に近づけて係留するためのロープ / 軍用橋の浮橋部分などを固定するためのロープ

The crew tightened the breast line to keep the yacht from drifting away during the storm.

乗組員は嵐の間、ヨットが流されないように係留ロープをきつく締めた。

Sense（1）

(nautical) A rope used to tie a small ship to a dock, keeping it close to the pier

Sense（2）

A rope to which the pontoons of a military bridge are fastened

breast lines

（ plural ）