1. lub-dub - Verb
2. lub-dub - Interjection
lub-dub
(onomatopoeia, medicine) Used to represent the normal rhythm of the heart on auscultation, comprising the first and second heart sounds.
lub-dub (third-person singular simple present lub-dubs, present participle lub-dubbing, simple past and past participle lub-dubbed)
(intransitive) Of a heart, to beat.