come about

verb

1. To come to pass; to develop; to occur; to take place; to happen; to exist.

   “We have to ask, how did this come about?”

   “In a review of operating experience with the Southern Region diesel-electric multiple-units on the Hastings line, read to the Institution of Locomotive Engineers in October, Mr. W. J. A. Sykes, Mechanical & Electrical Engineer of the S.R., revealed how the somehat unprepossessing appearance of these train sets came about.”

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. To change; to come round.

   “The wind is come about.”

   “On better thoughts, and my urg'd reasons, / They are come about, and won to the true side.”