'ashine' is formed from the adverbial prefix 'a-' plus the verb 'shine'. The prefix 'a-' here comes from Old English adverbial 'on'/'an' meaning 'in' or 'on', and 'shine' derives from Old English 'scīnan' (to shine).

'ashine' appears in Middle and Early Modern English as forms like 'aschien'/'ashinen' and later stabilized as 'ashine' in Modern English as an adverb/adjective formed from 'a-' + 'shine'.

Initially it meant 'in a state of shining' and over time has retained that basic sense of 'shining' or 'brightly', though its use has become somewhat archaic or poetic.