緩む ゆるむ N1
- to become loose; to slacken (e.g. rope)
- to become less tense; to let one's guard down; to relax
- to become lax; to slacken (e.g. coldness, supervision)
- (of ice) to partially melt; to become softer (e.g. ground, facial expression)
- to decrease (e.g. speed)
- (of a market price) to go down slightly