Diligence
. A four-wheeled stage-coach, drawn by four or more horses. Common in France before the introduction of railroads. The pun is well known.
Si vis placēre magistro, utĕre diligentia (i.e. his diligence).
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.