1) Breath as a measurable expenditure of life: Siddhar and haṭha-yogic traditions often treat lifespan as linked to the number and quality of prāṇa-movements. Fewer, subtler breaths (or the cessation/absorption of breath) are taken to conserve life-force.

2) “Vāsi”: In Siddha usage, vāsi can point to the subtle breath-current (often linked to the haṃsa-ajapā movement), or a technical phase of prāṇāyāma/retention. The verse treats it as something countable and regulable, hence a “unit” in an inner arithmetic.

3) “Burning” (எரிடுவான்): This commonly signals the ignition of inner heat—yogāgni/kundalinī-agni—by which impurities are ‘burnt’, and prāṇa is drawn into the central channel rather than dissipated through ordinary respiration. In a medical-alchemical register, it hints at stabilizing vāta (wind) by agni (fire), transforming gross breath-energy into a refined essence.

4) “Eating the vāsi” (வாசி யுண்பான்): Cryptically suggests a yogic reversal: instead of being carried by the breath, the practitioner ‘consumes’/assimilates it—i.e., breath becomes internal nourishment (nectar/ojas) and the outer breath may become minimal or suspended (kevala-kumbhaka imagery). This is presented as the doorway to the legendary longevity associated with “Mūlan.”

5) Mūlan: Likely Tirumūlar/Mūlan, emblematic of extreme yogic longevity in Tamil Siddha memory. The final claim functions less as a literal biography and more as a paradigmatic endpoint: mastery of vāsi culminates in an extraordinary extension of life (or a symbolic ‘life beyond ordinary measure’).