From Longman Dictionary of Contemporary Englishtouch base (with somebody)touch base (with somebody)to talk to someone to find out what is happening about something → base
Examples from the Corpus
touch base (with somebody)• It's important to touch base with our allies in this issue.• I just wanted to touch base with you.touch base (with somebody)touch base (with somebody)to talk to someone in order to find out how they are or what is happening I just wanted to touch base and make sure you hadn’t changed your mind about seeing me. → touchExamples from the Corpus
touch base (with somebody)• I just wanted to touch base with you. 