From Longman Dictionary of Contemporary Englishpractise what you preachpractise what you preachDOto do the things that you advise other people to do She didn’t always practise what she preached. → practise
Examples from the Corpus
practise what you preach• And Scott the rapier-slim rapper backs up this message by practising what he preaches.• Both Johnson and Lady Macleod found the book wanting, her objection being that the author did not practise what he preached.• I just wanted to see if he practised what he preached.• In most areas of life, he tries to practise what he preaches.• It is a good thing he practises what he preaches.• It is also important to practise what you preach.• The paper would practise what it preached.• The tight control on public sector pay is crucial and underlines the fact that the Government intends to practise what it preaches. 