Definition of overdot in US English:

overdot

verb

Music
  • with object In the performance of a musical piece: to prolong (a dotted note), and consequently shorten the succeeding note; to play so as to exaggerate a dotted rhythm.

Origin

1930s; earliest use found in The Times. From over- + dot.

Pronunciation

overdot

/ˌəʊvəˈdɒt/