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ऊरोः किमन्यदयतामुपमानभावं वामस्य दक्षिणमुमुष्य च तं विहाय ।
रम्भादयः सदृश इत्युचितं किमेतद्यस्योर्वशी सुभग साऽपि विभूतिलेशः ॥५६॥
T: Oh, the handsome Lord Śrī Varadarāja, the only comparison for Your left thigh can be with Your right thigh, nothing else, is it not? The converse is also true, as nothing else is comparable. Rambhā (banana plant trunk) and such don't qualify for comparison. The reason is that even Urvashī, the ultimate beauty and celestial nymph, emerged only from an iota of the beauty of Your thighs.
Explanation: Rambhā means the banana plant trunk (usually used for comparing beautiful thighs to), and Rambhā is one of the Apsaras (celestial nymphs). We should also recall the Purāṇic story of how Urvashī was created out of the thigh of Lord Nārāyaṇa. By stating that the thighs of Lord Śrī Varadarāja can be compared only with each other and nothing else, the poet is implying that nothing else in the world is worthy in beauty for comparison to them. Usually, the poets compare beautiful thighs to the banana plant trunk (Rambhā). The poet avers here that this comparison is not correct since the celestial nymph Rambhā's beauty was excelled by the beauty of Urvashī, the ultimate beauty among celestial nymphs; and she emerged from the Lord's thigh as stated in the Purāṇas!
This figure of speech called Upamānopameyālaṅkāra refers to two objects which can be compared only with each other in their particular quality of excellence.