(verb)
engaging in physical unarmed hand-to-hand combat either as a sport or as a fight, in which the two participants grapple and each aims to throw the other or hold them to the ground;
e.g. Two huge men were wrestling in the ring.
(verb)
forcing someone or something into a particular position, such as grappling a person into a place or posture or manipulating something to one's will with difficulty;
e.g. The guards were wrestling the shoplifter to the ground within minutes. He was wrestling the key into the lock of the door.
(verb)
combatting or struggling with some opposing force or difficulty, or engaging in deep thought or debate;
e.g. He is still wrestling with the idea of leaving his family behind.