only too

only too idiom
  1. At the very least, as a matter of fact, as in I know only too well that I can't win the lottery. This usage was first recorded in 1817.
  2. Very, extremely, as in I am only too glad to help. This usage was first recorded in 1899.

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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