come about

Short definition from Wiktionary

Verb

1. 1
   To come to pass; to develop; to occur; to take place; to happen; to exist.
2. 2
   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.
3. 3
   To change; to come round.