Somewhat resembling ale or having the characteristics of ale; having an ale-like quality or taste.
From English 'ale' (a fermented beverage) + '-ish' (somewhat, like). The '-ish' suffix creates an adjective meaning 'somewhat or slightly like the root word.'
Medieval brewers and tavern keepers used words like this to describe unclear or inferior drinks—'alish' meant it tasted vaguely beer-like but wasn't quite good enough to call proper ale.
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