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Phrase(s): heap something (up)on someone or something
1. Lit. to pile something up on someone or something. (Upon is formal and less commonly used than on.) • Please don’t heap so much trouble upon me! • Wally heaped leaves on the flower bed. 2. Fig. to give someone too much of something, such as homework, praise, criticism, etc. (Upon is formal and less commonly used than on.) • Don’t heap too much praise on her. She will get conceited. • The manager heaped criticism on the workers.
McGrawhill's American Idioms And Phrasal Verbs