At best

prep_phrase

Definitions

Adverb
  1. 1
    under the best of conditions wordnet
Prep_phrase
  1. 1
    In the most favorable of conditions, especially in a situation that is otherwise negative.

    "The signalman, as such, was unknown at first. At junctions, or for shunting, the pointsman was responsible both for setting the points and working the appropriate signals, the two being independent. As a result, accidents were comparatively frequent, and the pointsman's job was, at best, a hazardous one."

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