। ॥
In plain words
You taught the meaning of Oṃkāra to the Lord who captivates the mind of Vāṇī, and your mouth was ready to teach something even to your father. Today, by the weight of your wisdom, you have reached the place of guru to your elder brother. O Subrahmaṇya, though you are the youngest, in virtues you are greater than all.
Word for word
You taught the meaning of Oṃkāra to the Lord who captivates the mind of Vāṇī; your mouth was ready to teach something even to your father. Today you have reached the guruship of your elder brother by the weight of your wisdom; O Subrahmaṇya, though you have the place of the youngest, you are greater than all in virtues.