lark
[noun]
Synonyms:
- prank, caper, escapade, fun, game, jape, mischief
[verb]
Synonyms:
- lark about: play, caper, cavort, have fun, make mischief

[TahlilGaran] English Synonym Dictionary ▲

I. lark¹ /lɑːk $ lɑːrk/ noun [countable]
[Sense 1,5: Language: Old English; Origin: lawerce]
[Sense 2-4: Date: 1800-1900; Origin: lark 'to play around' (19-21 centuries), perhaps from lake 'to play' (11-20 centuries) (from Old English lacan), or from ⇒ lark(2) ]

1. a small brown singing bird with long pointed wings Synonym : skylark

2. informal something that you do to amuse yourself or as a joke
as/for a lark
I only went along for a lark.

3. blow/sod/bugger etc that for a lark British English spoken not polite used when you stop doing something or refuse to do something because it needs too much effort:
Paint the whole room? Sod that for a lark!

4. British English spoken used to describe an activity that you think is silly or difficult:
Salad again? How long are you going to keep up this healthy eating lark?

5. be up with the lark to get up very early

[TahlilGaran] Dictionary of Contemporary English ▲

II. lark² verb
lark about/around phrasal verb British English informal
to have fun by behaving in a silly way Synonym : mess about:
A couple of boys were larking about in the pool.

[TahlilGaran] Dictionary of Contemporary English ▲