Also means
to extend
Usage Note
Prolongar is used for stretching something in time or space, such as a meeting, a road, or a stay. The reflexive prolongarse is common when describing something that goes on longer than expected: la reunión se prolongó hasta la noche ('the meeting dragged on until evening'). It is a regular -ar verb.
Examples
"Decidieron prolongar las negociaciones."
Natural Translation
They decided to extend the negotiations.

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