go at

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go at (someone)

1. To physically attack someone with great ferocity or hostility. Watch out for that bull in the back field—he'll go at you if you get too close. John went at the burglar with a knife to defend his family.
2. To criticize, berate, or verbally harass someone at length and/or with great intensity. At the international summit, the foreign ambassador went at the president, demanding an explanation for the recent espionage allegations.

go at (something)

To engage in or undertake something with great energy, enthusiasm, or vigor. I'd been going at the report for two days straight when my computer suddenly crashed and wiped out half my work!

go at someone or something

to attack someone or something; to move or lunge toward someone or something. The dog went at the visitor and almost bit him. He went at the door and tried to break it down.

go at

Attack, especially with energy; also, proceed vigorously. For example, The dog went at the postman's legs, or Tom went at the woodpile, chopping away. This idiom is sometimes put as go at it, as in When the audience had settled down, the lecturer went at it with renewed vigor. [First half of 1800s]

go at

1. To undertake something or work on something, especially with enthusiasm or drive: She went at the job with a lot of energy. He went at that stain on the table with extra soap.
2. To attack something, especially with energy: My cat suddenly leaped up and went at the squirrel.