Śrīmad-Bhāgavatam 10.63.22
Blended reading (Sanskrit + English inline)
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jvaraḥ
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fever
Personified Śiva-jvara — a deity weapon, not a metaphor. Gauḍīyas read the verse's literalism as theology: even disease has a person; even fever serves a master. Bhagavān will return the favor in v. 23 by deploying His own Vaiṣṇava-jvara.
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tri-śirāḥ tri-pāt
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three-headed and three-footed
Compound: tri (three) + śiras (head) / pāda (foot). Standard iconography of the Śiva-jvara — three heads for cold/heat/sweating, three feet for movement in all phases. The grotesque body marks the tāmasa quality of fever as Śiva-tattva's lesser servant.
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abhyadhāvata
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rushed toward
Imperfect of abhi-√dhāv (to run at). The same direction-verb the asura used in v. 17 — running toward Bhagavān is what every Śiva-loyal force does in this chapter, and each one will end up taking shelter (v. 24).
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diśaḥ daśa
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the ten directions
Eight cardinal/intercardinal + up + down. The cosmographic completeness of the Śiva-jvara's burn: he sets all space alight. Bhagavān's reply will not match scale but rank: one Vaiṣṇava-jvara sufficient against ten directions of Māheśvara-jvara.
Śrīla Viśvanātha Cakravartī quotes the following description of the Śiva-jvara: jvaras tri-padas tri-śirāḥ ṣaḍ-bhujo nava-locanaḥ bhasma-praharaṇo raudraḥ kālāntaka-yamopamaḥ “The terrible Śiva-jvara had three legs, three heads, six arms and nine eyes. Showering ashes, he resembled Yamarāja at the time of universal annihilation.”
Jvara however ran towards him to fight. His form is described: he had three feet, three heads, six hands, nine eyes, and the ash weapon. Filled with anger he was like death personified at the time of annihilation.
Jvara rushed forward to fight (last phrase is understood but not stated in the text). Citsukha says that “Jvara fought” should be added to the verse. The bhūtas were driven away previously when Śiva fought. Or, because they fled, Jvara came. Hari-vaṁśa says: jvaras tri-padas tri-śirāḥ ṣaḍ-bhujo nava-locanaḥ bhasma-praharaṇo raudraḥ kālāntaka-yamopamaḥ nadan megha-sahasrasya tulya-nirghata-nisvanaḥ niḥśvasan jṛmbhanāṇs ca nidrān vitatanur bhṛśam The terrible Śiva-jvara had three legs, three heads, six arms and nine eyes. Showering ashes, he resembled Yamarāja at the time of universal annihilation. He breathed like a hurricane and roared like a thousand clouds. By yawning he spread sleep everywhere.
When ordinary weapons fail, Śiva sends his personified fever — three heads, three feet, burning ten directions — a walking heat-stroke. The image of an unbearable temperature given limbs is exactly what saṁsāra feels like to the bhakta still bound to material desire (v. 28).
My note
Source: vedabase.io