1.NounThe practice of expressing a particular opinion or performing a particular action in an attempt to make oneself look virtuous: commonly defensively in response to, or anticipation of, criticism; or aggressively, in assuming a moral posture in attacking an opponent.
"People of poor personal character may mistake all virtue for virtue signalling because they cannot even imagine anyone truly having the relevant virtues but they are quite familiar with the concept of pretending to have traits for malevolent reasons."
2.Verbpresent participle and gerund of virtue signal