From Longman Dictionary of Contemporary Englishstart on somebody/something phrasal verb1 START DOING somethingto begin doing something or using something You’d better start on your homework.2 START DOING something start somebody on something to make someone start doing something regularly, especially because it will be good for them Try starting your baby on solid foods at four months old.3 British English informalCRITICIZE to begin criticizing someone or complaining to them about something at Ray’s wife started on at him about spending too much time in the pub. → start→ See Verb table
Examples from the Corpus
start at• Boyle's family moved to London when he was eight and he started on guitar at fifteen with private lessons. 