A more thorough explanation:

Term: Est a scavoir
Definition: Est a scavoir is a legal term that means "it is to be understood or known." It comes from the Law French language and is believed to have originated from the Latin phrase "est sciendum." This term is often used to introduce a clarification or explanation of a previous statement.
Example: The contract states that the payment is due on the 15th of each month, est a scavoir, if the payment is not received by the 30th of the same month, a late fee will be charged.
In this example, the term "est a scavoir" is used to clarify the consequences of not making the payment on time. It is to be understood that a late fee will be charged if the payment is not received by the 30th of the same month.