From Longman Dictionary of Contemporary Englishphase something ↔ out phrasal verbSTOP DOING somethingSTOP something THAT IS HAPPENINGto gradually stop using or providing something The subsidy for company cars is to be phased out next year. → phase→ See Verb table
Examples from the Corpus
phase out• With over a third of the standing army enrolled in the colonies, the situation became dangerous and Nicholas phased them out.• All night long, as I heard the unique and spooky sounds, I phased in and out of sleep.From Longman Business Dictionaryphase something → out phrasal verb [transitive] to gradually stop using or providing somethingThe subsidy will be phased out. → phase→ See Verb table 