the.com/vote of confidence

means A formal show of backing for a leader or policy, often called precisely when people suspect the backing might not actually be there.

from Built from two sturdy pieces: 'vote,' from Latin 'votum' — a vow or wish, something solemnly pledged — and 'confidence,' from Latin 'confidere,' to trust fully. The phrase itself hardened into political jargon in parliamentary systems, especially British, where a government's survival literally depends on holding the chamber's trust; lose that vote and you lose office. So the term carries its origin like a loaded gun: it was never just an opinion poll, it was always a mechanism with teeth.