弛む

たるむ, たゆむtarumu

godan verb · intransitive

1. to slacken
2. to loosen
3. to relax
4. to droop (e.g. loose or flabby skin)
5. to sag (ceiling)
6. to slack off (e.g. one's work, attention)
7. to not put one's heart in

Study it in Yanamino