We found 2 dictionaries that define the word look one's best:

General (2 matching dictionaries)

1. look one's best: Merriam-Webster
2. look one's best: Wiktionary

Definitions from Wiktionary (look one's best) ▸ verb:  To have one's best possible appearance. ▸ Words similar to look one's best ▸ Usage examples for look one's best ▸ Idioms related to look one's best ▸ Wikipedia articles (New!) ▸ Words that often appear near look one's best ▸ Rhymes of look one's best ▸ Invented words related to look one's best