off on a lark

Meanings

1. 1phrasefixed phraseinformal

   Doing something impulsive and playful, often without planning or serious purpose.

   Grammar: Used after be, as in 'They are off on a lark'; it describes a state, not an action you perform on someone.

   Patterns

   • be off on a lark
   • go off on a lark

   They were off on a lark and ended up in a town none of them had heard of.

   He said he was off on a lark, just driving wherever the road took him.

   We went off on a lark and bought tickets to a show we knew nothing about.

2. 2phrasefixed phraseinformal

   Having left somewhere suddenly to do something fun and slightly foolish.

   Grammar: Often follows a verb like go or set; it suggests a quick, lighthearted departure.

   Patterns

   • go off on a lark
   • set off on a lark

   She set off on a lark to visit a friend three cities away.

   They went off on a lark after work and did not get home until midnight.

Common combinations

go off on a lark

We decided to go off on a lark and see where the train would take us.

be off on a lark

They are off on a lark somewhere in the hills.

set off on a lark

He set off on a lark with nothing but a small bag.

Synonyms and how they differ

on a whim

This focuses on the suddenness of the decision, while 'off on a lark' stresses the playful, carefree activity itself.

for fun

This is a general reason for doing something; 'off on a lark' suggests a whole outing or adventure done in that spirit.

Commonly confused: off on a lark or lark?

Practice

Make it your own

Write a sentence using “off on a lark”, then check it and compare it with the examples above.

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