How do you say 緩める　―　緩む yurumeru /-ru; yurumeta/ yurumu /-u; yurunda/ in English?

Relax (attention, efforts, etc.); to let down (one's guard); to relieve (tension); relax (a rule); to ease (e.g. restrictions); to loosen (control) (tv) 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 (vi)