「百密一疏」

(pos:語句)
<explanation>
yue:預計漏咗一樣嘢，搞到計劃前功盡廢
eng:to ruin a detailed plan because of a small oversight or miscalculation
<eg>
yue:本身諗住詐病見工，點知百密一疏，搭車俾同事見到。 (bun2 san1 nam2 zyu6 zaa3 beng6 gin3 gung1, dim2 zi1 baak3 mat6 jat1 so1, daap3 ce1 bei2 tung4 si6 gin3 dou2.)
eng:I planned to pull a sickie for a job interview, but the plan was ruined just because I was seen by a colleague on public transport.