tighten
verbUK /ˈtaɪtn/
US /ˈtaɪtn/
To make something more tight or firm.
Please tighten the lid on the jar so the cookies stay fresh.
OTHER MEANINGS
2. To make a rule or control stricter.
The school decided to tighten the rules about using phones in class.
3. To become tense or stiff, especially muscles.
My shoulders tighten when I sit at the computer too long.
4. To make something smaller or more limited.
The company had to tighten its budget after sales dropped.