1sin 
/ˈsɪn/ noun
plural sins /ˈsɪn/ noun 1 : an action that is considered to be wrong according to religious or moral law [count] ▪ He committed the sin of stealing. ▪ Murder is a sin. ▪ I confessed my sins. [noncount] ▪ We are not free from sin. ▪ a world of sin — see also cardinal sin, deadly sin, mortal sin, original sin, venial sin 2 [count] : an action that is considered to be bad — usually singular ▪ It's a sin to waste food. — see also besetting sin
(as) guilty/miserable/ugly as sin
informal : very guilty/miserable/ugly
▪ Even though he was acquitted, most people think he is guilty as sin. ▪ That house is as ugly as sin.
▪ Even though he was acquitted, most people think he is guilty as sin. ▪ That house is as ugly as sin.
for your sins
chiefly Brit, humorous — used to say that you are doing something unpleasant, difficult, etc., as a form of punishment ▪ For my sins, I was made chairman of the board.
live in sin — see 1live
