一気
いっき · ikki · JLPT N1 · noun
push
🥤 一 = one + 気 = breath or spirit: drink or push it all in one breath, no pause
気 means breath, spirit or energy. 一気 is one breath's worth of effort, so you finish the thing without stopping to take air.
一 — single horizontal stroke
一 is one of the simplest pictographs in Chinese, depicting a single horizontal line to represent the number one. It has retained essentially the same form since oracle bone script over 3,000 years ago. By extension it also means 'first,' 'whole,' or 'same.'