|Origin:||prechier, from Late Latin praedicare, from Latin dicare 'to say publicly'|
1 [intransitive and transitive]RR
to talk about a religious subject in a public place, especially in a church during a service
Christ began preaching to large crowds.
He traveled the southern states, preaching the gospel.
to talk about how good or important something is and try to persuade other people about this:
Alexander has been preaching patience.
preach the virtues/merits/benefits of something
a politician preaching the virtues of a free market
to give someone advice, especially about their behaviour, in a way that they think is boring or annoying
grown-ups preaching about the evils of drugs
to talk about what you think is right or important to people who already have the same opinions as you