Source : WordNet®

lark about
     v : play boisterously; "The children frolicked in the garden";
         "the gamboling lambs in the meadows"; "The toddlers
         romped in the playroom" [syn: {frolic}, {lark}, {rollick},
          {skylark}, {disport}, {sport}, {cavort}, {gambol}, {frisk},
          {romp}, {run around}]