# upcall

> English word · Noun

## Definitions
1. A call from a lower-level subsystem, such as a kernel or framework, to a higher-level subsystem, such as user code.

## Etymology
From up- + call.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/upcall