change of circumstances

Definition from Nolo’s Plain-English Law Dictionary

A reason for a court to modify an existing order for the payment of alimony and/or child support. In most cases, in order to seek a change in the support amount, the person seeking the change must show that circumstances (such as the employment, health, or income of the payor) have changed from when the order was made.

Definition provided by Nolo’s Plain-English Law Dictionary.