In college football, a receiver "boxing out" like in basketball is not inherently offensive pass interference (OPI), but it can become OPI depending on the circumstances. Here’s how the NCAA rules typically apply:

Legal Actions:

• A receiver is allowed to establish position and use their body to shield a defender, as long as they don’t initiate significant contact or impede the defender's ability to make a play on the ball.
• The receiver can legally occupy space and use their body as part of their positioning to catch the ball.

When It Becomes Offensive Pass Interference:

• Pushing Off: If the receiver uses their hands or arms to push off a defender to create separation or gain an advantage, it’s OPI.
• Blocking Downfield: If the ball is still in the air and the receiver makes contact resembling a block (rather than trying to catch the ball), this is OPI because receivers cannot block defenders before the ball is caught.
• Impeding the Defender: If the receiver initiates significant contact that prevents the defender from having a fair opportunity to play the ball, it’s OPI.

Key Points:

• The intent and degree of contact matter. Referees will judge whether the action unfairly impedes the defender's ability to defend the pass.
• If the receiver simply positions themselves without initiating unnecessary or excessive contact, it is usually allowed.

In practice, this is often a judgment call by the officials, and subtle "boxing out" moves might not draw a penalty unless they're overly aggressive.