To perform an act of masturbation.(verb-intransitive)
To perform an act of masturbation on.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "masturbate" in a sentence
"If Ratzinger wants to stay in Italy and scare school kids by telling them God is watching when they French kiss or masturbate, that is his sexual silliness."
"I stick my fingers in my butt when I masturbate, which is several times a day."
"In Sunday's Observer, Baroness Warnock urged men who couldn't get sex for free to masturbate, which is not quite how it probably strikes the average punter."