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Tattva Bodhaतत्त्वबोधः
Tattva Bodha · passage 7

Restraint

दमः कः? चक्षुरादिबाह्येन्द्रियनिग्रहः ।
damaḥ kaḥ? cakṣurādibāhyendriyanigrahaḥ |

What is dama? The reining in of the outer senses, the eye and the rest.

In plain words

What is dama (restraint)? Control of the outer senses, such as the eyes.