Definition of lark noun from the Oxford Advanced Learner's Dictionary

     

    lark

     noun
    noun
    BrE BrE//lɑːk//
     
    ; NAmE NAmE//lɑːrk//
     
     
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  1. 1 a small brown bird with a pleasant song see also skylark
  2. 2[usually singular] (informal) a thing that you do for fun or as a joke The boys didn't mean any harm—they just did it for a lark.
  3. 3(British English, informal) (used after another noun) an activity that you think is a waste of time or that you do not take seriously Perhaps this riding lark would be more fun than she'd thought.
  4. Word Originnoun sense 1 and be/​get up with the lark. Old English lāferce, lǣwerce; related to Dutch leeuwerik and German Lerche; of unknown ultimate origin. noun senses 2 to 3 and blow/​sod that for a lark. early 19th cent.: perhaps from dialect lake ‘play’, from Old Norse leika, but compare with skylark in the same sense, which is recorded earlier.Idioms
    be/get up with the lark
     
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    (old-fashioned, British English) to get out of bed very early in the morning
    blow/sod that for a lark
     
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    (British English, slang) used by somebody who does not want to do something because it involves too much effort Sod that for a lark! I'm not doing any more tonight.