気きが抜ぬける

1. 1to lose heart ; to lose interest ; to lose motivation ; to be discouraged Translated by Jiyomi
2. 2to become stale (i.e. of a carbonated beverage) ; to go flat ; to lose flavor ; to lose flavour ; to be exhausted ; to feel spent
3. 3to lose focus ; to let one's guard down ; to become absent-minded

Other writings and readings

JMdict entry 1639450. Source and licence.