11.33 Therefore airse, win glory. Conering your foes, enjoy a prosperous kingdom. By Me they have been slain already. You be merely an instrument, O Arjuna, you great bowman!
Meaning
Be thou merely an apparent or nominal cause. I have already killed them in advance. I have destroyed them long ago. Fame People will think that Bhishma. Drona and the other great warriors whom even the gods cannot kill have been defeated by you and so you will obtain great fame. Such fame is due to virtuous Karma only. Satrun Enemies such as Duryodhana. Savyasachi Arjuna who could shoot arrows even with the left hand.
Word by word
तस्मात् therefore त्वम् thou उत्तिष्ठ stand up यशः fame लभस्व obtain जित्वा having conered शत्रून् enemies भुङ्क्ष्व enjoy राज्यम् the kingdom समृद्धम् the unrivalled मया by Me एव even एते these निहताः have been slain पूर्वम् before एव even निमित्तमात्रम् a mere instrument भव be सव्यसाचिन् O ambidexterous one.