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dim2 past tense and past participle dimmed, present participle dimming
1 [intransitive and transitive] if a light dims, or if you dim it, it becomes less bright : 
The lights in the theatre began to dim.
The lights in the theatre began to dim.2 [intransitive and transitive] if a feeling, quality etc dims or is dimmed, it grows weaker or less : Even the rain could not dim their enthusiasm. Hopes of a peaceful settlement have dimmed.
Even the rain could not dim their enthusiasm.Hopes of a peaceful settlement have dimmed.3 to lower the angle of the front lights of your car, especially when someone is driving towards you [= dip British English]
