Actually, Billy’s outward listlessness was a screen. The listlessness concealed a mind which was fizzing and flashing thrillingly.

...the principle of metonymy is simply to substitute for the plain name of a thing a name or phrase based on something connected with it.

some 'ah-neh' stole my hp! not tt i'm a racist but i saw this indian or dunno bhangra walking near me on the way to the mrt stn and din realise tt i lost my hp till i got on the train at jurong east to look for it.

The car is in my possession.