Meaning of the Sanskrit Word: nanrtuh

  nanrtuh—began to dance    SB 7.8.36, SB 8.11.41, SB 9.10.41
  nanrtuh—danced    SB 7.10.68, SB 8.4.2
  nanrtuh—very nicely danced on the occasion    SB 8.8.12
  nanrtuh—danced in transcendental bliss    SB 10.3.6

Can't find any compound Sanskrit words containing nanrtuh.