「曲がる」(magaru) means to turn, usually at a corner or intersection, or to bend. It is an intransitive verb. You often use the particle "に" to indicate the direction you are turning. For example: 右に曲がる。(Migi ni magaru.) = To turn right.

道の角などで方向を変えることです。「〜に曲がる」の形で使います。例：左に曲がる。