what is the meaning of navkar antra

You seem to mean Navkar (Namokar) Mantra. Its simple meaning is a bow of respect to the five supreme beings (Panch Parameshthi). Line‑by‑line:

• Namo Arihantāṇam — I bow to the Arihants (perfect beings who have destroyed inner passions and attained omniscience).
• Namo Siddhāṇam — I bow to the Siddhas (liberated souls who have reached moksha).
• Namo Āyariyāṇam — I bow to the Acharyas (heads of the monastic order).
• Namo Uvajjhāyāṇam — I bow to the Upadhyayas (spiritual teachers).
• Namo Loe Savva Sāhūṇam — I bow to all sadhus and sadhvis (monks and nuns) in the universe.

Essence:

• This prayer does not ask for favors; it honors the pure qualities of these exalted beings and inspires us to cultivate the same virtues.
• The concluding verse teaches: “This five-fold salutation destroys all sins and is the foremost among auspicious auspicious things,” emphasizing the mantra’s power for inner purification.

Sect note:

• Digambar and Shvetambar traditions recite the same five salutations with minor pronunciation differences in Prakrit; the meaning and reverence are identical. Some traditions also recite the concluding verse after the five lines.

For a simple explanation, see this short guide: and an overview: