verb with object

waste (something, especially money or time) in a reckless and foolish manner:

«…に» 〈金･時間･機会など〉を浪費する, むだ［ふい］にする «on»

e.g. entrepreneurs squander their profits on expensive cars.

allow (an opportunity) to pass or be lost:

e.g. the team squandered several good scoring chances.

squanderer |ˈskwänd(ə)rər| noun

late 16th century: of unknown origin.