FLAT-OUT
Meaning of FLAT-OUT in English
Function: adverb
Synonyms: FAST 2, apace, expeditiously, hastily, lickety-split, posthaste, quickly, rapidly, speedily, swiftly
Merriam Webster.
Collegiate thesaurus English dictionary.
Английский энциклопедический толковый словарь тезауруса.
2012