Definition: to become loose or make something loose Level: C2
他迅速松开了抓住绳子的手。
He quickly ___loosened his grip on the rope.
公司正在放宽严格的着装规定，允许更休闲的服装。
The company is ___loosening its strict dress code to allow more casual attire.
随着时间的推移，绳结会自然松动并解开。
Over time, the knot will naturally ___loosen and come undone.
