= в
во цвете лет — in the prime of life, in one's prime
во всеуслышание — publicly, in everyone's hearing
во всеоружии ( рд. ) — fully armed (with), fully possessed (of), in full possession (of)
во что бы то ни стало — at any price, at all costs
во главе ( рд. ) — at the head (of)
во имя ( рд. ) — in the name (of)