Mask

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Masking refers to the conscious or unconscious suppression or hiding of elements of a person's identity, personality, or natural behavior. This is often referred to as a social survival strategy – used to conform to expected 'norms', cope with situations or environments, or avoid expressing anxiety. Self-suppression can cause lasting harm to an individual's happiness, security, and sense of self.

Can be used in reference to any mental phenomena, not just plurality.