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Jyutping gei1 zan3
Pinyin jī zhèn

Definitions (Wiktionary)
  1. verb, slang
    to have sex on an airplane
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    汤姆感觉手机震荡了。
    湯姆感覺手機震盪了。
    tāng mǔ gǎn jué shǒu jī zhèn dàng le 。
    • Tom felt his phone vibrate.
Examples (粵典–words.hk)
  1. Cantonese
    影相用脚架就可以减少相机震动。
    影相用腳架就可以減少相機震動。
    jing2 soeng2 jung6 goek3 gaa2 zau6 ho2 ji5 gaam2 siu2 soeng2 gei1 zan3 dung6.
    • Shooting with a tripod can reduce camera shake.