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1. To secure or bind something (to something else), especially at a higher level. A noun or pronoun can be used between "lash" and "up." I had to use a bungee cable to lash my bike up to the railing outside my office. We lashed up a sign telling everyone about the new rules.
2. To construct something very hastily, haphazardly, or shoddily. A noun or pronoun can be used between "lash" and "up." We'll have to lash up a rudimentary fence to keep the cattle in until we get the material in for a proper one. You can tell they lashed these houses up as quickly and as cheaply as possible.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.