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We show that the $m_W$ measurement is a direct probe of New Physics (NP)contributing to lepton and missing transverse momentum ($\ell+MET$),independently from indirect tests via the electroweak fit. Such NP modifies thekinematic distributions used to extract $m_W$, necessitating a simultaneous fitto $m_W$ and NP. This effect can in principle bias the $m_W$ measurement, butonly to a limited extent for our considered models. Given that, we demonstratethat the agreement at high-precision with SM-predicted shapes results in boundscompetitive to, if not exceeding, existing ones for two examples: anomalous $W$decay involving a $L_{\mu} - L_{\tau}$ gauge boson and $\tilde{\nu}_{l}\tilde{l}$ production in the MSSM.

A new purpose for the $W$-boson mass measurement: searching for New Physics in lepton+$MET$