it's someone's loss
Definition of it's someone's loss
—used to say that one thinks another person could be helped by or would enjoy something which that person has chosen not to do or have If she doesn't want to come to the party, it's her loss.
Word by Word Definitions
: the player in a game who performs the principal action of the game (such as trying to find others in hide-and-seek)
: some person : somebody
: destruction, ruin
: the act of losing possession : deprivation
: the harm or privation resulting from loss or separation
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