Nautical Term: Under below

Definition of Under below

The term ‘under below’ refers to a warning issued from above deck level. It’s like getting a heads-up, but from a lookout or a sailor aloft.

For instance, imagine a sailor on the crow’s nest spotting a squall forming on the horizon. The sailor quickly raises the alarm by shouting, ‘Squall, hard astarboard, under below!’ The crew below deck immediately take action to secure their ship before the squall hits.

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