noun, verb ·Rare ·Advanced level

Definitions

Noun

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

Verb

1. 1
   To perform such a call.

Etymology

From down- + call.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.