Arunachala, You, as the bright, resplendent sun, swallow all the dualities that seem real to the deluded jiva (soul). Shine brightly so that the lotus in my heart (that is in the bud state still) can blossom to its fullest by your grace.
The darkness of ignorance of the deluded jiva creates sense-based illusory world and then takes it to be real and suffers in it (and from it). With the grace for guru that darkness gets dispelled. This is what Bhagavan means when he says ‘sagalamum vizhungum’ by ‘that which swallows everything’. Just as the darkness enveloping the earth disappears immediately on sunrise, Bhagavan asks tArunachala (Lord of light. Arunachala appeared as pillar of light according to Puranas ) to remove the ignorance surrounding the lotus of his heart.
My note: ‘salasam’ in Tamil is ‘jalajam’ (lotus) in Sanskrit as Tamil doesn’t have certain sounds and letters such as ‘ja’ although such sounds have been integrated in common parlance for a long time.