| 1. | any of numerous, chiefly Old World oscine birds, of the family Alaudidae, characterized by an unusually long, straight hind claw, esp. the skylark, Alauda arvensis. |
| 2. | any of various similar birds of other families, as the meadowlark and titlark. |

| 1. | a merry, carefree adventure; frolic; escapade. |
| 2. | innocent or good-natured mischief; a prank. |
| 3. | something extremely easy to accomplish, succeed in, or to obtain: That exam was a lark. |
| 4. | to have fun; frolic; romp. |
| 5. | to behave mischievously; play pranks. |
| 6. | Fox Hunting. (of a rider) to take jumps unnecessarily: He tired his horse by larking on the way home. |

lark
In addition to the idiom beginning with lark, also see happy as the day is long (as a lark).