「坐地起價」

(pos:語句)
<explanation>
yue:乘機加價
eng:to raise the price (to take advantage of a situation)
<eg>
yue:人龍太長，的士就坐地起價。 (jan4 lung4 taai3 coeng4, dik1 si2 zau6 zo6 dei6 hei2 gaa3.)
eng:The queue is extremely long. Taxis raise their price in response.