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friction
In a physical sense, this word evokes a feeling of heat, grinding, and slowing down. It describes the tactile struggle between two opposing forces that prevents smooth motion, often resulting in wear and tear or a sudden stop. When used socially, it describes a psychological tension that makes a relationship feel abrasive. It suggests a grating quality where people rub each other the wrong way, creating a spark of anger or a drag on productivity rather than a harmonious flow.
Countable when referring to specific instances of conflict between people. Uncountable when referring to the physical force of resistance between surfaces.