To engage in playful, silly behaviour, especially instead of working or being serious.
"The students were larking around at the back of the classroom while the teacher wrote on the board."
To behave in a silly, playful, and carefree manner, typically when one ought to be more serious.
To play silly games and have fun instead of doing serious things.
2 meanings, ordered from most common to least. Color-coded by CEFR level.
To engage in playful, silly behaviour, especially instead of working or being serious.
"The students were larking around at the back of the classroom while the teacher wrote on the board."
To spend time in a lighthearted, aimless way, enjoying oneself without a specific purpose.
"We spent the whole Saturday larking around the park with no plans whatsoever."
See 'lark about' — 'a lark' is a cheerful bird or a fun escapade; 'larking around' pictures moving about playfully like a carefree creature.
To play silly games and have fun instead of doing serious things.
Essentially synonymous with 'lark about'. Predominantly British. The two forms are interchangeable in most contexts and speakers often choose one over the other purely by habit.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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