। ॥ ७४० ॥
In plain words
Just as the word 'Ganges' leaves behind its direct meaning to point toward the bank, so too the words 'That' and 'Thou' release their literal scopes entirely.
Close to the Sanskrit
Just as the word Ganges, having abandoned its own meaning, indicates the bank, so too the word 'That' or the word 'Thou', having completely abandoned its own meaning...