'knock about' definitions:

Definition of 'knock about'

From: WordNet
verb
Strike against forcefully; "Winds buffeted the tent" [syn: buffet, knock about, batter]
verb
Be around; be alive or active; "Does the old man still kick around?" [syn: kick around, knock about, kick about]

Synonyms of 'knock about'

From: Moby Thesaurus