adverb, adjective Nautical.
as slow as possible without losing steerageway.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for dead slow
They've stolen my ship from me, and I can tell by the roll of her she's practically hove to under a dead-slow bell this minute.Cappy Ricks Retires|Peter B. Kyne