at bottom

at bottom idiom
Fundamentally, basically; also, in reality. For example, He may speak somewhat bluntly, but at bottom he's always honest. Charles Dickens used this idiom in Nicholas Nickleby (1838): “He's a good pony at bottom.” [Early 1700s]

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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