at first

at first idiom
Initially, at the start, as in At first the berries were green, but when they ripened they turned bright red. [Second half of 1500s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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