be quiet for a momentAn imperative meaning “be quiet for now” or “quiet down for a moment.” It can sound blunt or rude, especially without a polite particle; ครับ or ค่ะ softens it somewhat.
TH: เงียบก่อนนะครับ ผมกำลังฟังอยู่
EN: Please be quiet for a moment—I’m trying to hear what she’s saying.