Pronunciation: (u-sib'u-lāt"), [key]
—v., -lat•ed, -lat•ing. Phonet.
to change into or pronounce with the accompaniment of a sibilant sound or sounds.
1. to change by assibilation.
2. to become a sibilant or a sound containing a sibilant.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.