Definition of adverbial particle noun from the Oxford Advanced American Dictionary

 

adverbial particle

 noun
noun
 
(grammar)
 
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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 the Oxford Advanced Learner's Dictionary entry: adverbial particle