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dead slow

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adverb, adjective Nautical.
  1. as slow as possible without losing steerageway.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for dead slow

Historical Examples

  • 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