Definitions

1. noun

a sum of money that is owed or a delayed payment

“She had to pay the arrear of taxes on her property.”

2. noun

a delay or postponement of something, especially a payment or a task

“The project was delayed due to the arrear in funding.”

3. verb

to fall or remain behind in something, especially a payment or a task

“The company has fallen behind in its payments and is now in arrear.”