Nattamaaven arul arunacahala
Arunachala! If you don’t touch me with your hands (of grace) and embrace me, I will suffer from the loss of life’s purpose, of having been born. Please make sure it doesn’t happen.
‘AruL kai thottu’ is an indirect reference to Bhagavan’s plea for sparsha diksha (where the master touches the disciple to initiate (sparsha is to touch). It is impossible for jiva with its ego-body consciousness to attain Siva swarupam (form of Siva), hence Bhagavan is asking Arunachala for his grace so as to merge with him.
The bride is beseeching the groom, Arunachala, with his limitless powers and strength, ever youthful quality, untarnished fame, to come and hold and embrace her. Here, jiva (soul) is the bride and the lord is the groom. The purpose of the birth of jiva (piravi payan, piravi = birth, payan = usefulness/purpose) is to merge with Siva and enjoy the bliss of self realisation. Bhagavan says to the lord if you don’t do this, then the purpose of my life will be lost. (nattam also nashtam is loss).