(1):

(v. i.) To strive in debate; to engage in discussion; to dispute; to argue.

(2):

(v. t.) To struggle for; to contest.

(3):

(v. i.) To struggle or exert one's self to obtain or retain possession of, or to defend.

(4):

(v. i.) To strive in opposition; to contest; to dispute; to vie; to quarrel; to fight.