


" "Hack away" suggests a cutting action which involves/requires more time and effort.
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HUBLOTAre these three all correct?Yes.
HUBLOTDo they mean the same?Roughly. "away" adds a feeling of doing it vigorously and repeatedly/continuously. "at" may lubricate the phrase and/or emphasise the bush as a target, or in some contexts suggest more haphazard or ineffective activity.