Definitions

1. noun

A device or tool used to tighten something, especially a screw or bolt.

“The mechanic used a wrench as a tightener to secure the loose engine part.”

2. verb

To make something tighter or more secure, especially by twisting or turning a screw or bolt.

“Please tighten the loose screw on the chair before it falls apart.”

3. noun

A person or thing that causes something to become tighter or more secure.

“The weather conditions acted as a tightener, causing the bridge to creak under the heavy snow.”