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Related to at first: at first glance
Initially. At first, we planned to go to Florida, but now we're going to visit family in Montana instead. I didn't like Tom at first, but the more time I spent with him, the more I enjoyed his company.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
initially; at the very beginning. He was shy at first. Then he became more friendly. At first we chose the red one. Later we switched to the blue one.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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.