вдвое

в- (v-) +‎ дво́е (dvóje)

• IPA^(key): [ˈvdvojə]

• Audio:

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вдво́е • (vdvóje)

1. twice
2. in half

• Dal, Vladimir (1880–1882), “вдвое”, in Толковый Словарь живаго великорускаго языка [Explanatory Dictionary of the Living Great Russian Language] (in Russian), 2nd edition, Publication of the bookseller-typographer Wolf, M. O.