The self-acting valve closed when the pressure dropped, preventing a dangerous leak.

Clinicians preferred the faster-acting medication because it relieved symptoms sooner.

The fast-acting pain reliever reduced my headache within minutes.

Of all the cold medicines on the shelf, this one is the fastest-acting for easing congestion.

We switched to a slower-acting fertilizer to avoid shocking the young plants.

Among the medications we tested, this was the slowest-acting, producing noticeable effects only after several days.

The slow-acting medication eased his pain over several days.

The committee, acting upon new evidence, reopened the investigation.

During low tide, the actinias clung to the rocks, their tentacles waving in the shallow pools.

Tonight she is second-acting after the lead lost their voice.