From Longman Dictionary of Contemporary Englishbe/keep/stay etc in touch (with something)be/keep/stay etc in touch (with something)to have the latest information or knowledge about something A regular newsletter keeps people in touch with local events. The speech was good and you felt he was in touch with people’s needs. Rescuers were kept in touch through radio links. A head-teacher needs to remain in close touch with teachers’ everyday concerns. → touch
Examples from the Corpus
be/keep/stay etc in touch (with something)• They had been classmates as undergraduates at City College of New York and had always stayed in touch.• One friend, a lawyer, swears by e-mail because it helps her keep in touch with far-flung friends.• But Letitia stayed in touch, and together, sadly as it turned out, they had found family member Number Three.• We may have to be in touch again.• Lots of traveling dads and moms are now using e-mail to stay in touch.• EASY-TO-USE Paging is a simple but fast way to keep in touch.• I want you to stay in touch.• The idea was to hang together, keep in touch with the audience and maybe make a few bucks. 