alternate, take turns -- (do something in turns; "We take turns on the night shift")
Overview of adj alternate
The adj alternate has 4 senses
alternate -- (every second one of a series; "the cleaning lady comes on alternate Wednesdays"; "jam every other day"- the White Queen)
alternate, alternative, substitute -- (serving or used in place of another; "an alternative plan")
alternate, alternating -- (occurring by turns; first one and then the other; "alternating feelings of love and hate")
alternate -- (of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired; "stems with alternate leaves")