शरवणभवम्
शर · वन · भव
शराणां वनम्
तत्पुरुष (genitive) — a thicket of reeds
शरवणे भवः जन्म यस्य तम्
बहुव्रीहि — the one whose birth was there
बहुव्रीहि — it refers to देवम्. born in the reed-thicket — Mallinātha fixes the first member from the Śabdārṇava, शरो बाणे बाणतृणे, 'śara is an arrow and the grass an arrow is made of', and takes the second sense: reeds. He then accounts for the ण of शरवण, which is a sound change 8.4.5 प्रनिरन्तःशरेक्षुप्लक्षाम्रकार्ष्यखदिरपीयूक्षाभ्योऽसंज्ञायामपि makes to the न् of वन after शर and nine other words. The last thing he does is the most interesting: he cites Vāmana to license the compound's shape. भव in it means जन्म, birth, and the first member stands in the locative while the whole word is an adjective in the accusative — the members do not agree, which is the sort of bahuvrīhi called व्यधिकरण. Vāmana's rule is अवर्ज्यो बहुव्रीहिर्व्यधिकरणो जन्माद्युत्तरपदः, 'a bahuvrīhi in जन्मन् and its like is unavoidably of unlike case', and Mallinātha glosses अवर्ज्य as अगतिकत्वादाश्रयणीयः, 'to be resorted to because there is no other way'. So the irregular form is defended as the only form available
uncheckedMallinātha, Sañjīvinī, citing the Śabdārṇava and Vāmana; the sūtra number 8.4.5 from skt-mcp“śarā bāṇatṛṇāni || “śaro bāṇe bāṇatṛṇe” iti śabdārṇave || teṣāṃ vanaṃ śaravaṇaṃ “pranirantaḥ śare-” ityādinā ṇatvam | tatra bhavo janma yasya taṃ śaravaṇabhavam || “avarjyo bahuvrīhirvyadhikaraṇo janmādyuttarapadaḥ” iti vāmanaḥ | avarjyo'gatikatvādāśrayaṇīya ityarthaḥ”