it serves someone right

it serves someone right

or

serves someone right

COMMON If you say it serves someone right or serves someone right when something unpleasant happens to them, you mean that it is their own fault and you have no sympathy for them. Matt Walker has retired early from his day's surfing with a broken board. It serves him right, he says, for trying to surf bad water. Serves her right for being so stubborn.
See also: right, serve