The clause in a trust deed or mortgage which permits the mortgagee to declare the entire unpaid sum due upon a default by a mortgagor is called an acceleration clause.
Being the same name, the clause is also used in different contexts. One is for language and the second is for legal work. For the given statement, the clause here is used for the legal work.
A clause is basically a specified or separated article, stipulation, or provision that is applied in a treaty, bill, or contract. When there is an acceleration clause applied, then in the case of delay in the payment, the whole amount of the mortgage will be due.
Therefore, in the acceleration clause, the entire unpaid sum is due.
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