ODE→a- (2)

a- (2)

EnglishOxford Dictionary of English

a-2 /ə

/

▸ prefix to; towards:

aside

ashore.

▪ in the process of (an activity):

a-hunting.

▪ in a specified state:

aflutter.

▪ on:

afoot.

▪ in:

nowadays.

– ORIGIN Old English, unstressed form of on.