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2. hard knock
Someone who lives a life full of hardships.

Also a song by Jay Z
I'm homeless, lost an eye, got shot, I'm addicted to drugs, and persistently tortured by God for all my sins. It's a hard knock life...
1. hard knock
A hard knock, a gangster or sumone who leads a hard life or has been through hard times.
its a hard knock lyfe biatch!
by kyle Apr 8, 2003 add a video
3. hard knock
A term used in the military, for storming a house using violent force. It doesn't nessicerily mean shooting or throwing grenades before entering a room, but the soldiers will be highly alert and ready to do so.
The opposite is a "soft knock" which means knocking on the door and "asking" calmly to come in.
We did a hard knock on a house in Basra.
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