A “default” is a failure to comply with a provision in the lease. “Curing” or “remedying” the default means correcting the failure or omission. A common example is a failure to pay the rent on time. Failing to meet any of the requirements in a lease can legally constitute default, e.g., not showing evidence of insurance, removing trees if prohibited by the lease, not repairing a structure. A landlord can also default by not performing certain responsibilities. Typically a lease will give the parties adequate notice and time to fix the problem before more drastic action is taken.