godan verb (-ku), intransitive verb
go against; disobey; betray; run counter to
Used for violating rules, expectations, trust, or one's own conscience. Often implies a deliberate turning away from something one should follow.
彼は親の期待に背いて、芸術の道に進んだ。
He went against his parents' expectations and pursued a career in art.
Acts that go against the law are not permitted.
信頼に背くようなことはしたくない。
I don't want to do anything that would betray trust.