Meaning of the Sanskrit Word: upatasthuh

  upatasthuḥ—worshiped    SB 4.1.54-55, SB 7.4.22-23
  upatasthuḥ—prayed    SB 4.7.23, SB 6.9.20
  upatasthuḥ—offered prayers    SB 3.13.33
  upatasthuḥ—worshiped.    SB 5.3.3
  upatasthuḥ—began to offer prayers    SB 8.20.32-33

Can't find any compound Sanskrit words containing upatasthuh.