Definition of "tumble"
tumble
/ˈtʌmbl̩/
noun
plural tumbles
(informal) An act of sexual intercourse.
verb
third-person singular simple present tumbles, present participle tumbling, simple past and past participle tumbled
(intransitive) To perform gymnastics such as somersaults, rolls, and handsprings.
(intransitive, informal) To have sexual intercourse.