- 一口气 yìkǒuqì breatha single breath; often used to symbolize a person's life or vitality
- 一口咬定 yìkǒuyǎodìng to assert flatly; to insist; to allegeTo stick firmly to a statement or view; to assert something with absolute certainty or without any room for doubt
- 松一口气 sōngyīkǒuqì to breathe a sigh of reliefto feel relief after a period of tension or hard work; to relax after a stressful situation
- 反咬一口 fǎnyǎoyīkǒu to make a false counterchargeTo make a false countercharge against an accuser; to turn on one's accuser and blame them instead.
- 一口吃个胖子 yīkǒuchīgepàngzi to be impatient for successto want to get fat with only one mouthful; to try to achieve one's goal in the shortest time possible or expect results too quickly
- 如出一口 rúchūyīkǒu with one voicewith one voice; unanimously; to speak as if from the same mouth, indicating that everyone has the same opinion or position
- 倒吸一口凉气 dàoxīyīkǒuliángqì to gaspto gasp in amazement, fear, or shock; to feel a sudden chill run down one's spine
- 倒抽一口气 dàochōuyīkǒuqì to gaspto inhale suddenly due to shock, surprise, or dismay
- 统一口径 tǒngyīkǒujìng to coordinate one's storyTo adopt a unified approach to discussing an issue or answering questions; to agree on a consistent public statement.
- 舒一口气 shūyīkǒuqì to heave a sigh of reliefTo breathe out deeply as a way of releasing tension or expressing relief
- 一口价 yīkǒujià fixed priceA price that is set and cannot be bargained over; a take-it-or-leave-it price.
- 一口吃不成胖子 yìkǒuchībùchéngpàngzi Rome wasn't built in a dayliterally "one cannot get fat with a single mouthful"; used as a proverb to mean that nothing significant can be accomplished in a single effort or that any great achievement requires time and persistence
- 一口气儿 yīkǒuqìr one breathone breath; the air taken in during a single inhalation
- 一口钟 yikouzhong bella large bell
- 一口饭 yìkǒufàn a mouthful of foodA bite of food; a small amount of nourishment
- 一身一口 yīshēnyīkǒu family of oneA person living alone with no family; a single person who is the sole member of their household.