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Entry 2 senses · 2 variants Webster, 1913

Posthaste

· Post·haste · IPA /ˌpoʊstˈheɪst/
01 n. Haste or speed in traveling, like that of a post or courier.
  1. 1.
    Haste or speed in traveling, like that of a post or courier.
02 adv. With speed or expedition; as, he traveled posthaste; to send posthaste.
  1. 1.
    With speed or expedition; as, he traveled posthaste; to send posthaste.