bunk
»Don’t see anything for it, but for him to do a bunk.»—»Not a bad idea that, only where’s ’e to bunk to?» (P. Kelver II. 56. 8.)
A young clerk.
To bunk, probably originally schoolboy slang, means to escape, run away, take to flight (because of ‘funk’, or to avoid punishment).
To do a bunk: colloquial use of do with a verb stem used as a noun = achieve, perform, the action denoted by the verb. Cf. to do a drink.