Denoting relation to some thing or person that is
   superior, weighs upon, oppresses, bows down, governs, directs,
   influences powerfully, or the like, in a relation of subjection,
   subordination, obligation, liability, or the like; as, to travel under
   a heavy load; to live under extreme oppression; to have fortitude under
   the evils of life; to have patience under pain, or under misfortunes;
   to behave like a Christian under reproaches and injuries; under the
   pains and penalties of the law; the condition under which one enters
   upon an office; under the necessity of obeying the laws; under vows of
   chastity.