for a loop
see knock for a loop.
Cozy Words For A Cold DayLike a cup of hot cocoa topped with melty marshmallows, some words have the power to make us feel comfy on cold winter days.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.