prepréčiti to prevent (from); to hinder, to obviate (something); to obstruct, to bar; to thwart; to frustrate, to foil, to baffle
prepréčiti delo (v parlamentu) to obstruct
prepréčiti nesrečo to prevent an accident
prepréčiti naklepe komu to baffle someone's designs
preprečili so mi načrte, naklepe I was thwarted in my plans, designs
prepréčiti načrte sovražniku to thwart the enemy's plans
bolje je prepréčiti kot lečiti prevention is better than cure, a stitch in time saves nine