Definition of slow adverb from the Oxford Advanced American Dictionary

     

    slow

     adverb
    adverb
    NAmE//sloʊ//
     
    (slower, slowest)
     
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  1. 1(used especially in the comparative and superlative forms, or in compounds) at a slow speed synonym slowly
  2. 2 Could you go a little slower? slow-drying paint slow-moving traffic Drive slow!
  3. Which Word?slow / slowly Slowly is the usual adverb from the adjective slow. Slow is sometimes used as an adverb in informal language, on road signs, etc. It can also be used to form compounds:Slow. Major road ahead. a slow-acting drug They walk very slow. In informal comparisons, both slower and more slowly are used:Can you speak slower/more slowly?In formal language, and especially in writing, slowly is used as the adverb form.Idioms
    go slow (on something)
     
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    to show less enthusiasm for achieving something The government is going slow on tax reforms.
See the Oxford Advanced Learner's Dictionary entry: slow