whale away - Phrases/Idioms
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.
Attack physically or verbally, as in Our boys whaled away at the enemy, or The talk-show host whaled away at the hostile critics. The word whale here does not allude to the ocean mammal, but means “flog” or “thrash.” [Mid-1800s]