Definition of wedge:
one of the simple machine
s; A piece of material, such as metal or wood, thick at one edge and tapered to a thin edge at the other for insertion in a narrow crevice, used for splitting, tightening, securing, or levering (Wikipedia article
); a quantity of money
"I made a big fat wedge from that job."
to support or secure using a wedge; to force into a narrow gap
"I wedged open the window with a screwdriver."