Meaning of “shake sth out” - Learner’s Dictionary

shake sth out

phrasal verb with shake uk us /ʃeɪk/ verb (past tense shook, past participle shaken)

to hold something that is made of cloth at one end and move it up and down in order to get rid of dirt

(Definition of “shake sth out” from the Cambridge Learner’s Dictionary © Cambridge University Press)