  Measurement is one of the key concepts which discriminates classical and
quantum physics. Unlike classical systems, a measurement on a quantum system
typically alters it drastically as a result of wave function collapse. Here we
suggest that this feature can be exploited for inducing quench dynamics in a
many-body system while leaving its Hamiltonian unchanged. Importantly, by doing
away with dedicated macroscopic devices for inducing a quench -- using instead
the indispensable measurement apparatus only -- the protocol is expected to be
easier to implement and more resilient against decoherence. By way of various
case studies, we show that our scheme also has decisive advantages beyond
reducing decoherence -- for spectroscopy purposes and probing nonequilibrium
scaling of critical and quantum impurity many-body systems.
