also: どっちも
Used in affirmative sentences to mean 'both' of two items or people.
I like both apples and oranges.
Used with a negative predicate to mean 'neither' or 'not either'. The negative form follows later in the sentence.
Neither is correct.
I think both of these two proposals are good.
彼はお茶とコーヒー、どちらも飲まなかった。
He didn't drink either tea or coffee.
どちらでもない means 'neither one', while どちらも means 'both' apply equally.
どちらか means 'either one' (choosing one of two), whereas どちらも means 'both' in affirmative sentences or 'neither' in negative ones.
Casual contraction of どちらも, common in informal speech.
Rare kanji spelling; it is rarely used. Learners should use kana.
Compound of どちら (which of two) + も (inclusive particle). The casual form どっちも is a contraction of どちらも.