adverbial particle
noun /ædˌvɜːbiəl ˈpɑːtɪkl/
/ædˌvɜːrbiəl ˈpɑːrtɪkl/
(grammar)- 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.