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general::
Phrase(s): keep in touch (with someone)
Go to in touch (with someone)., Phrase(s): keep in touch (with someone or something) [and] remain in touch (with someone or something); stay in touch (with someone or something)
to maintain communications with someone; to maintain up-to-date knowledge about someone or something. (See also get in touch (with someone).) • After my neighbor moved, we still remained in touch. • I want to stay in touch with my office over the weekend., Phrase(s): Keep in touch.
Good-bye. (Sometimes a sarcastic way of saying good-bye to someone one doesn’t care about.) • Nice talking to you. Keep in touch. • Sorry, we can’t use you anymore. Keep in touch.
McGrawhill's American Idioms And Phrasal Verbs