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Phrase(s): alternate with something
1. [for someone] to serve as a substitute for someone. • I alternated with Fred as the lead in the school play. • They asked Harry to alternate with Ron on the team. 2. [for something] to appear repetitively and regularly in a sequence with something else. (For instance, A alternates with B in the sequence ABABAB.) • In this design the straight lines alternate with the circles. • The red dots alternate with the blue ones.
McGrawhill's American Idioms And Phrasal Verbs