alternate
adjective
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occurring by turnsalternating
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every second one of a series
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of leaves and branches etc
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serving or used in place of anotheralternative
noun
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someone who takes the place of another personreplacement
verb
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to do something in turns“I alternate between biking and swimming.”take turns
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to go back and forth“I alternated between watching tv and playing video games.”jump
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to be an understudy or alternate for a role“I alternate for some famous actors I'm not allowed to name.”understudy