live in sin
To cohabit as if husband and wife without being married.
Ralph: Athene gone and got married? Builder: No. It's—it's that she's gone and—and not got married. . . . I suppose you'd have me eat humble pie and tell Athene she can go on livin
ADJ
cardinal, deadly, mortal | unforgivable | venial
besetting
Procrastination has been my besetting sin since I started university.
original
Many people believe that humans are born with original sin according to their faith.
VERB + SIN
commit
confess
After years of guilt, he finally decided to confess his sins to the priest.
forgive (sb their)
PREP
~ against
Breaking a promise to your best friend feels like sinning against their trust.