  Extreme ultraviolet (EUV) waves are impressive coronal propagating
disturbances. They are closely associated with various eruptions, and can used
for the global coronal seismology and the acceleration of solar energetic
particles. Hence, the study of EUV waves plays an important role in solar
eruptions and Space Weather. Here we present an EUV wave associated with a
filament activation that did not evolve into any eruption. Due to the
continuous magnetic flux emergence and cancellation around its one end, the
filament rose with untwisting motion, and the filament mass flowed towards
another end along the rising fields. Intriguingly, following the filament
activation, an EUV wave formed with a fast constant speed ($\sim$500 km
s$^{-1}$) ahead of the mass flow, and the overlying coronal loops expanded both
in lateral and radial directions. Excluding the possibility of a remote flare
and an absent coronal mass ejection, we suggest that the EUV wave was only
closely associated with the filament activation. Furthermore, their intimate
spacial and temporal relationship indicates that the EUV wave was likely
directly triggered by the lateral expansion of overlying loops. We propose that
the EUV wave can be interpreted as linear fast-mode wave, and the most vital
key for the successful generation of the EUV wave is the impulsive early-phase
lateral expansion of overlying loops that was driven by the activated filament
mass flow without any eruption.
