「白費」

(pos:動詞)(sim:嘥)
<explanation>
yue:浪費（時間、精力、心機），令到啲嘢 #白 做
eng:to waste, usually used when time and effort spent on a certain task turned out to be pointless.
<eg>
yue:佢倒瀉晒阿婆整畀佢嗰啲午餐，白費阿婆一番心機。 (keoi5 dou2 se2 saai3 aa3 po4 zing2 bei2 keoi5 go2 di1 ng5 caan1, baak6 fai3 aa3 po4 jat1 faan1 sam1 gei1.)
eng:He spilled his lunch prepared by his grandmother. The time and effort she's put in is now wasted.