the single highest amount = no other high amount was as high as this one. I would call the adverb 'single' in this expression a sort of intensifier. No other answer to the question is possible in this expression.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Son JamesLast,the phrase of Westcoast Industries' purchase of Minute Media means " Purchase of Minute Media in the Westcoast Industries",isn't that