clamp down on something or someone Definition

clamp¹
noun

1. A tool with adjustable jaws for gripping things firmly or pressing parts together.

Thesaurus: vice, press, grip, brace, bracket, clasp, fastener.
2. A reinforcing or fastening device, used in woodwork, etc.
3. A heavy metal device fitted to the wheels of an illegally parked car, to prevent it being moved.

Form: wheel clamp (usually)

verb clamped, clamping

1. To fasten together or hold with a clamp.

Thesaurus: fasten, secure, brace, fix, clinch.
2. To fit a clamp to a wheel of (a parked car) to stop it being moved.
3. To hold, grip, shut or press tightly.

Etymology: 14c: from Dutch klampe.

Phrasal Verb: clamp down on something or someone

To put a stop to or to control it or them strictly.