The star implodes and becomes a black hole.

He was suffering from muscle contractions due to pain.

His leg suddenly underwent a spasm.

In this chemical reaction, condensation occurs.

Because the wind became strong, the captain ordered to reef the sail.

This sentence is written in a contracted form.

This fabric contracts when it absorbs water.

He underwent a stomach plication surgery.

He went into a frenzy and began to destroy the room.

He went off in a frenzy out of anger.