knock down with a feather
see under knock for a loop.
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Question 1 of 7
What does “blatherskite” mean?
Words nearby knock down with a feather
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.