Prevent

stop block hinder avoid check restrict inhibit obstruct frustrate arrest repress counteract impede restrain limit interrupt forbid preclude prohibit foil avert defend against hold back hold off ward off stave off rule out head off forestall anticipate obviate thwart baffle counter debar intercept interdict turn aside put a stop to put an end to shut out nip in the bud keep lid on dampen chill cool cork dam forfend balk