Tra từ tighten - Từ điển Oxford Advanced Learner 8th

tight·en [tighten tightens tightened tightening] BrE [ˈtaɪtn] NAmE [ˈtaɪtn] verb
1. intransitive, transitive to become or make sth become tight or tighter
•~ (up) The rope holding the boat suddenly tightened and broke.
•His mouth tightened into a thin line.
•~ sth (up) to tighten a lid/screw/rope/knot
•The nuts weren't properly tightened and the wheel came off.
•She tightened her grip on his arm.
•The brake cable needs tightening up.
2. transitive ~ sth to make sth become stricter
•to tighten security
•The government is to tighten controls on the sale of alcohol.
Opp: ↑loosen
Idiom: ↑tighten your belt
Derived: ↑tighten up
Verb forms:

Synonyms:
save
budget • economize • tighten your belt
These words all mean to spend less money.
save • to keep money instead of spending it, often in order to buy a particular thing: ▪ I'm saving for a new car.
budget • to be careful about the amount of money you spend; to plan to spend an amount of money for a particular purpose: ▪ If we budget carefully we'll be able to afford the trip.
economize • to use less money, time, etc. than you normally use
tighten your belt • (rather informal) to spend less money because there is less available: ▪ With the price increases, we are all having to tighten our belts.
to save up/budget for sth
to have to save/budget/economize/tighten our belts
to try to/manage to save/budget/economize

Example Bank:
•He felt his stomach tighten.
•He saw his father's jaw tighten in irritation.
•He tightened his grip on my hand.
•Her face tightened with pain.
•Her fingers tightened convulsively with every jolt she received.
•Her grip seemed to tighten on the door handle.
•His hand tightened painfully around her wrist.
•His mouth tightened into a thin hard line.
•His words made her throat tighten.
•Steps were taken to tighten discipline in the school.
•The law in this area has been tightened up considerably.
•The nuts weren't properly tightened and the wheel came off.
•This tool is for tightening screws.