। ॥ १८ ॥
In plain words
Daughter of the mountain — beholding your unsurpassed beauty, Gaṅgā's whole body became water from sheer fear. Therefore Giriśa, seeing her lotus face and moved by compassion, established her by letting her dwell on his own head.
Close to the Sanskrit
O daughter of the mountain, having beheld your unsurpassed beauty, Gaṅgā, out of extreme fear alone, became one whose body was made of water. Therefore Giriśa, having looked upon her lotus face, out of compassion granted her standing by giving her residence upon his own head.