whale away
whale away {v.}, {informal}
1. To beat or hit hard; strike again and again. — Often used with "at".
The boxer is whaling away at his opponent with both fists.
2. To attack severely or again and again; go on without stopping or with great force; pound away.
Mary has been whaling away on the typewriter for an hour.
- Often used with "at".
During the election the Mayor whaled away at the other party in his speeches.
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Source: A Dictionary of American Idioms