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1. To tie or bind two people or things together. A noun or pronoun can be used between "lash" and "together." The criminals began lashing hostages together so no one would be out of their sight. Make sure to lash these wooden beams together so they don't roll around the truck while we're driving.
2. To assemble or create something very hastily or carelessly; to cobble something together. A noun or pronoun can be used between "lash" and "together." I had completely forgotten about the presentation I had to give, so I just lashed together some sales charts and reports generated by computer. You can tell that he lashed the essay together at the last second.
lash something together
to tie something or things together. Let's lash these logs together and make a raft. Lash two or three of the poles together to make them stronger.