Definitions for "Anticipatory breach"
One party to a contract informing the other of his or her intent not to perform before performance is due. A legal action may be brought even though the original contract (not yet due for performance) has not been breached. Example: The buyer informs the seller before the closing date of his or her intent not to buy.
a breach of contract committed prior to the time of required performance
an unequivocal indication that the party will not perform when performance is due