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1. Maintaining contact with another person, especially at intervals so as to stay up to date with each other's lives. My old high school friends and I tried remaining in touch after we graduated, but we all started drifting apart once college got underway. Now, make sure you keep in touch, OK? I want to hear all about your time in Paris!
2. Abreast or aware of current happenings or trends. You really need to be in touch with what's happening on social media if you're going to be an effective reporter.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*in touch(with someone)
1. Fig. in contact with someone by letter or telephone. (*Typically: be ~; get ~; keep ~.) I tried to get in touch with her, but she never answered her phone. I just couldn't seem to get in touch.
2. Fig. [of oneself] having self-knowledge. (*Typically: be ~; get ~.) I need to get in touch with myself and the way I really feel about things. She needs to try more to be in touch with herself and her feelings.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
1. Aware of the latest developments, as in current events or an area of interest.
2. Able to appreciate or understand the concerns or difficulties of others.
3. Able to be contacted, as by telephone or e-mail: I will be in touch by phone after I arrive at the hotel.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.