Как по Английски будет pretensar

noun

Stress applied to an object during manufacture or prior to some other treatment, usually in order to counteract applied loads.

adjective

Occurring before a stressed syllable.

verb

To apply stress to (an object or material) during manufacture or prior to some other treatment, especially so as to counteract applied loads; specifically to reinforce concrete with steel rods or wires which have been tensioned while the concrete is setting.