Definition of allargando in US English:

allargando

adverb & adjective

  • (especially as a direction) getting slower and slower, and often also fuller in tone.

    • ‘There are constant indications in the score of riten, allargando, largamente, and so on, most of which you do seem to observe.’
    • ‘Masur simply, a bit austerely intoned the opening chorale of the Adagio, creating relief for the violins to effortlessly make their line in allargando unison to follow it very compellingly.’

Origin

Italian, ‘broadening’.

Pronunciation

allargando

/ˌälərˈɡändō/