tighten

verb
C1+
1
C1+
to hold or fix something more securely in position; to make something or become more difficult to move, open or separate
سفت کردن, محکم کردن, تنگ کردن
2
C1+
to make something become stricter
سخت‌گیرتر کردن, تشدید کردن, افزایش سخت‌گیری
to tighten security
The government is to tighten controls on the sale of alcohol.
Steps were taken to tighten discipline in the school.
3
C1+
to become stretched so that it cannot stretch much further; to stretch or pull something in this way
سفت کردن, محکم کردن
The rope holding the boat suddenly tightened and broke.
His mouth tightened into a thin line.
She tightened the straps on her backpack.
4
to become painful or uncomfortable because of illness or emotion
دردناک شدن, منقبض شدن, دچار تنش شدن, احساس فشار کردن
He felt his stomach tighten.
Her face tightened with pain.
His words made her throat tighten.