GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Hack, v. t. [imp. & p. p. Hacked (hăkt); p. pr. & vb. n. Hacking.] [OE. hakken, AS. haccian; akin to D. hakken, G. hacken, Dan. hakke, Sw. hacka, and perh. to E. hew.  Cf. Hew to cut, Haggle.]
   1. To cut irregulary, without skill or definite purpose; to notch; to mangle by repeated strokes of a cutting instrument; as, “to hack a post”.
   
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   My sword hacked like a handsaw. Shak.
   
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   2. Fig.: To mangle in speaking.  Shak.
   
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   3. (Computers) To program (a computer) for pleasure or compulsively; especially, to try to defeat the security systems and gain unauthorized access to a computer.
   
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   4. To bear, physically or emotionally; as, “he left the job because he couldn't hack the pressure”. [Colloq.]
   
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