'act as' definitions:

Definition of 'act as'

(from WordNet)
verb
Function as or act like; "This heap of stones will act as a barrier"
verb
Pretend to have certain qualities or state of mind; "He acted the idiot"; "She plays deaf when the news are bad" [syn: act, play, act as]

Synonyms of 'act as'

From: Moby Thesaurus