緩む

to become loose; to slacken (e.g. rope)

to become less tense; to relax; to let one's guard down

to slacken (e.g. coldness, supervision); to become lax

to become softer (e.g. ground, facial expression); (of ice) to partially melt

to decrease (e.g. speed)

(of a market price) to go down slightly