Definition of posthaste in English:

posthaste

Syllabification: post·haste
Pronunciation: /ˈpōstˈhāst
 
/

adverb

With great speed or immediacy: she would go posthaste to England
More example sentences
  • The persons responsible ought to be prosecuted in the first instance, the deck must be removed post-haste and the destroyed vegetation replaced immediately.
  • Or was she so strapped for time that she had to write it in post-haste and not even proof read it once.
  • Our State and Federal Governments, intimidated by the medical fraternity's recent show of muscle, have scuttled new liability legislation through their parliaments post-haste.
Synonyms
as quickly as possible, without delay, (very) quickly, speedily, without further/more ado, with all speed, promptly, immediately, at once, straightaway, right away
informal pronto, straight off, at warp speed

Origin

mid 16th century: from the direction “haste, post, haste,” formerly given on letters.

Definition of posthaste in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous