Oxford Dictionary English adverbial particle nounnoun BrE BrE//ædˌvɜːbiəl ˈpɑːtɪkl// ; NAmE NAmE//ædˌvɜːrbiəl ˈpɑːrtɪkl// (grammar) Add to my wordlistjump to other results an adverb used especially after a verb to show position, direction of movement, etc. In ‘come back’, ‘break down’ and ‘fall off’, ‘back’, ‘down’ and ‘off’ are all adverbial particles.See adverbial particle in the Oxford Advanced American DictionaryCheck pronunciation: adverbial particle oxfordlearnersdictionaries.com