"larking" in the verb sense
1. frolic, lark, rollick, skylark, disport, sport, cavort, gambol, frisk, romp, run around, lark about
"The children frolicked in the garden"
"the gamboling lambs in the meadows"
"The toddlers romped in the playroom"
Source: WordNet® (An amazing lexical database of English)
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