Longman Dictionary of Contemporary English homepage

alternate

2 verb
     
al‧ter‧nate2 [intransitive and transitive]
if two things alternate, or if you alternate them, they happen one after the other in a repeated pattern
alternate between
She alternated between outrage and sympathy.
alternate with
Periods of depression alternate with excited behavior.
alternate something and/with something
Twist your body, alternating right and left stretches.
alternation noun [uncountable and countable]

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