come about

(intransitive) To come to pass; to develop; to occur; to take place; to happen; to exist.

(intransitive, nautical) To tack; to change tack; to maneuver the bow of a sailing vessel across the wind so that the wind changes from one side of the vessel to the other; to position a boat with respect to the wind after tacking. See also come to.

(intransitive) To change; to come round.