(1):
(v. t.) To meet or fall in with, as something inconvenient, harmful, or onerous; to put one's self in the way of; to expose one's self to; to become liable or subject to; to bring down upon one's self; to encounter; to contract; as, to incur debt, danger, displeasure/ penalty, responsibility, etc.
(2):
(v. t.) To render liable or subject to; to occasion.
(3):
(v. i.) To pass; to enter.