prevent

To keep from happening; avert.

To keep (a person or thing) from doing something; impede.

To anticipate or counter in advance.

To come before; precede.

To present an obstacle.

To go before; be earlier than; anticipate; forestall.

To take previous measures against; hence, to frustrate; disappoint; evade; escape.

To hinder from action by the opposition of obstacles; impede; restrain; check; preclude: generally followed by from.

To keep from existing or occurring; render impossible.