Wiktionary
knock about
n. an informal game, usually football vb. 1 to spend time with someone as a friend 2 To do a relaxing activity. 3 To be in an unknown place. 4 To hit someone, or behave violently towards them.
WordNet
knock about
v. strike against forcefully; "Winds buffeted the tent" [syn: buffet, batter]
be around; be alive or active; "Does the old man still kick around?" [syn: kick around, kick about]