spread under

spread (something) under (someone or something)

To open, stretch, or unfold something and lay it out underneath someone or something else. Spread a tarp or some newspapers under you while you're painting. I don't want any getting on the floor! I have a canvas that I spread under my workbench. That way, I can pick it up at the end of the day and just shake all the metal shavings and debris out into the dumpster.
See also: spread

spread something under someone or something

to extend or unfold something, such as a tarpaulin, beneath someone or something. Please spread some newspapers under Jimmy while he is working this clay. Would you spread some newspapers under your work, please?
See also: spread