be at it hammer and tongs
To do something or perform some task with tremendous fervor, determination, energy, or forcefulness. An allusion to the force with which a blacksmith strikes metal using a hammer and tongs. What started as a minor disagreement has escalated into a heated argument, and the two have been at it hammer and tongs ever since. She really wants to get an A on her term paper, so she's been at it hammer and tongs. Ugh, we've been at it hammer and tongs for hours and we still haven't come up with a solution.
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