Might mean (unverified): Invocation from subclass to superclass.
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We found one dictionary that defines the word upcall:

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  1. upcall: Wiktionary

Definitions from Wiktionary (upcall)

noun:  (programming) A call from a lower-level subsystem, such as a kernel or framework, to a higher-level subsystem, such as user code.
verb:  To perform such a call.

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