whale of a time
A very enjoyable experience, as in We had a whale of a time in Puerto Rico. This idiom alludes to the largest mammal to describe something very large and impressive. [Colloquial; early 1900s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.