發蹄揗

蹄揗 is probably built upon the root 揗 (tan4, “to shiver in fear”). Folk etymology incorrectly suggests borrowing from English frightened.

發⫽蹄揗 (verb-object)

1. (Cantonese) to feel agitated

   • 仲有發吽哣、發雞盲、發瘟、發蹄騰、飛蚊症、發耳搛、口淡淡、面青青、生蟲、生漬、車呔肚、鬼祟肉、拜拜肉、出水痘、生鼓脹、禿頭、頭大冇腦、大眼的噹、蚊叮蟲咬、鴨乸腳、䟴腳、主婦手、香港腳…… [Cantonese, trad.]
     仲有发吽哣、发鸡盲、发瘟、发蹄腾、飞蚊症、发耳搛、口淡淡、面青青、生虫、生渍、车呔肚、鬼祟肉、拜拜肉、出水痘、生鼓胀、秃头、头大冇脑、大眼的当、蚊叮虫咬、鸭乸脚、䟴脚、主妇手、香港脚…… [Cantonese, simp.]

     From: 2004, 《麥兜菠蘿油王子》 [McDull, Prince de la Bun], 內外全科

     zung⁶ jau⁵ faat³ ngau⁶ dau⁶, faat³ gai¹ maang⁴, faat³ wan¹, faat³ ti⁴ tan⁴, fei¹ man¹ zing³, faat³ ji⁵ zaang⁶, hau² taam⁵ taam⁵, min⁶ ceng¹ ceng¹, saang¹ cung⁴, saang¹ zik¹, ce¹ taai¹ tou⁵, gwai² syu² juk⁶, baai^3-1 baai³ juk⁶, ceot¹ seoi² dau^6-2, saang¹ gu² zoeng³, tuk¹ tau⁴, tau⁴ daai⁶ mou⁵ nou⁵, daai⁶ ngaan⁵ dik¹ dok¹, man¹ deng¹ cung⁴ ngaau⁵, aap³ naa² goek³, ngan³ goek³, zyu² fu⁵ sau², hoeng¹ gong² goek³...... [Jyutping]

     And spacing out, night blindness, craziness, agitation, eye floaters, humming ears, dry mouth, bloodless cheeks, parasites, malnutrition, pot belly, sneaky fat, batwings, chicken pox, abdominal swelling, baldness, mindlessness, large eyes, mosquito stings and bug bites, flatfoot, leg shaking, housewife's hand, athlete's foot...

   • 聽日佢會去考試，所以係度發晒□揗囉 [Cantonese, trad.]
     听日佢会去考试，所以系度发晒□揗啰 [Cantonese, simp.]

     From: 2008, Adams Bodomo, A Corpus of Cantonese Ideophones

     ting¹ jat⁶ keoi⁵ wui⁵ heoi³ haau² si⁵, so² ji⁵ hai² dou⁶ faat³ saai³ ti⁴ tan⁴ lo¹ [Jyutping]

     S/he is sitting for an exam tomorrow, so s/he is getting agitated now.