Collocations for sin - noun

cardinal, deadly, mortal
egregious (esp. AmE), grave, great, grievous, heinous
unforgivable, unpardonable
venial
original
the Christian doctrine of original sin

past
We have repented for past sins. Now it's time to move on.

commit
confess
They had confessed their sins and done their penance.

repent
expiate
They would have to expiate their sins through suffering.

wash away
The holy water washes away their sins.

forgive
punish
consider sth
It's considered a sin to be disrespectful to your parents.
Usury is considered a sin.

tax (esp. AmE)
sin taxes on cigarettes and alcohol

bin (BrE,sports)
Both sides lost a player to the sin bin just before the interval.

sin against
a sin against God

sin of
the sin of pride

the forgiveness of sin, the forgiveness of sins
We believe in the forgiveness of sins.

the seven deadly sins
Idleness, in her book, was possibly the deadliest of the seven deadly sins.

a sin of commission (= doing sth you should not do), a sin of omission (= not doing sth you should do)
the sins of the fathers
Our sons will pay for the sins of their fathers.

the sins of the flesh (= sexual acts that you should not do)
Even politicians are not immune from the sins of the flesh.