Come learn 2000+ kanji and 6000+ vocabulary words with WaniKani.
transitive verb, ichidan verb
緩む is "to loosen," but has to do with loosening on its own. This word is when you loosen or relax something, meaning to loosen or to relax.
The reading comes from 緩む, so you can use that!
Please feel free to loosen the necktie.