Dictionary
pro•long
Pronunciation: (pru-lông', -long'), [key]—
v.t.
1. to lengthen out in time; extend the duration of; cause to continue longer:
to prolong one's stay abroad.
2. to make longer in spatial extent:
to prolong a line. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.