Synonyms:

sva-dharmam–one’s own religious principles; api–also; ca–indeed; aveksya–considering; na–never; vikampitum–to hesitate; arhasi–you deserve; dharmyat–from religious principles; hi–indeed; yuddhat–than fighting; sreyah–better engagements; anyat–anything else; ksatriyasya–of the ksatriya; na–does not; vidyate–exist.

Translation:

Considering your specific duty as a ksatriya, you should know that there is no better engagement for you than fighting on religious principles; and so there is no need for hesitation.