How to pronounce 嘥氣 in Cantonese (2 out of 3):

問 man6

to ask

to inquire about

to interrogate

to hold responsible

嚟 lei4

used in transliteration

to come

used as a final particle to add emphasis

嘥氣 saai1 hei3

(phrasal verb) to do things in vain; to waste someone's efforts for nothing