back payment
/bˈak pˈeɪmənt/
/bˈæk pˈeɪmənt/
Etymology
English
The phrase combines 'back' (used since the 1600s to mean 'belonging to an earlier time' or 'in arrears') with 'payment'. 'Back pay' appeared in the late 1800s in labour and employment contexts, and 'back payment' followed as a fuller form of the same idea.