1 - a complaint about being treated in an unfair way:

have a grievance: People know who to go to if they have a grievance.
2 - a feeling that you have been treated in an unfair way:
sense of grievance: This sense of grievance began with the confiscation of their land.
nurse a grievance: For years he nursed a grievance against his former employer.

A particular variation of the victim card in which a person gains sympathy or social status by amassing experiences of perceived sleights or injustices. Grievance-collecting can be entirely fabricated, true, or a mix of the two. Grievance-collectors can never forgive or see another side of the story, because surrendering any grievance would result in loss of power over other people. Grievance-collecting can be personal, or part of a politically correct group dynamic.

When your minority status, or "otherness", out trumps another's.

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A shared narrative of victimhood that seeks to subvert and replace old traditions, cultures, and institutions to uplift the victims. Usually leads to a formation of a new moral in-group for activist movements and reparations.

The rights to have a grievance against a company, political or religious institution.