What is the meaning of lark?

noun

• North American songbirds having a yellow breast.
  • synonyms: meadowlark
• A songbird that lives mainly on the ground in open country; has streaky brown plumage.
  • synonyms: pipit, titlark
• Any of numerous predominantly Old World birds noted for their singing.
• Any carefree episode.
  • synonyms: escapade

verb

• Play boisterously.
  • usage: "The children frolicked in the garden"; "the gamboling lambs in the meadows"; "The toddlers romped in the playroom"
  • synonyms: frolic, rollick, skylark, disport, sport, cavort, gambol, frisk, romp, run around, lark about