not for a moment

not for a moment idiom
Never, not in the least, as in Not for a moment did I believe he was telling the truth. This expression employs moment in the sense of “the tiniest length of time,” a usage dating from the mid-1300s.

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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