UTMOST
ADJECTIVES
► SUMMOPEROUS utmost, highest → 1647 obs.
NOUNS
► DEAD-LEVEL BEST utmost; the best of one’s abilities → 1956 Amer. dial.
PHRASES
► ONE’S LEVEL BEST the utmost one can possibly do; one’s very best → 1873 colloq., orig. US
VERBS
► DO ONE’S MAIN to do one’s utmost, to do one’s best → c1375 obs.
Lexicophilia 