In plain words
The poet, to the Lord: The earth that you measured in your vast form [as Trivikrama], stretching out your red feet like an open lotus, so that the quarters trembled and the heavens shook: did it not lie that day on a corner of one of your tusks, when you became a peerless boar with tusks made for battle, plunged into the waters [of the deluge] and dug it up?