To enter into; to make way into the interior of; to pierce.

(figuratively) To achieve understanding of, despite some obstacle; to comprehend; to understand.

To affect profoundly through the senses or feelings; to move deeply.

To infiltrate an enemy to gather intelligence.

To insert the penis into an orifice, such as a vagina, mouth, or anus.

(chess) To move a piece past the defending pieces of one's opponent.