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heap (something) on (someone or something)
To place a large or excessive amount of something on someone or something. Everyone has been heaping praise on the firefighter who risked his life to save the little girl from the blaze. He's been quick to heap scorn on the media for covering the election with a biased agenda.
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.