Better restraineth. The verb means to hold fast, as Luk 8:15 : to hold back, as Luk 4:42. See on Rom 1:18. He refers to some power which hinders the revelation of the man of sin or Antichrist.
In his time (ἐν τῷ αὐτοῦ καιρῷ)
Better, in his own season, Not before his appointed season.