Tighten | Mean of tighten in English Dictionary

/ˈtaɪtn̩/

• Verb
• to make (something) tight or tighter or to become tight or tighter
1. I'll tighten the screw.
2. She tightened her hold on the handle.
3. His jaw muscles tightened.
• to become more strict or effective or to make (something) more strict or effective
1. Security around the building has tightened up recently.
2. They tightened up security around the building.
3. We installed new machines to tighten up the assembly line.