loosen

verb
1
to make something less tight or strongly fixed; to become less tight or strongly fixed
شل شدن, شل کردن, سست شدن, سست کردن
synonym slacken
2
to make a piece of clothing, hair, etc. loose, when it has been tied or fastened
شل کردن, باز کردن, گشاد کردن
She loosened her hair so that it fell over her shoulders.
3
to hold somebody/something less tightly
شل کردن
He loosened his grip and let her go.
(figurative)The military regime has not loosened its hold on power.
4
to make something weaker or less carefully managed than before
شل کردن, سست کردن, ضعیف کردن
The party has loosened its links with big business.
synonym relax