Pile1  —n. 1 heap of things laid upon one another. 2 large imposing building. 3 colloq. A large quantity. B large amount of money. 4 a series of plates of dissimilar metals laid one on another alternately to produce an electric current. B = *nuclear reactor. 5 funeral pyre. —v. (-ling) 1 a (often foll. By up, on) heap up. B (foll. By with) load. 2 (usu. Foll. By in, into, on, out of, etc.) Crowd hurriedly or tightly.  pile it on colloq. Exaggerate. Pile up 1 accumulate; heap up. 2 colloq. Cause (a vehicle etc.) To crash. [latin pila]