'restrained' originates from the Latin word 'restringere,' where 're-' meant 'back' and 'stringere' meant 'to bind.'

'restringere' transformed into the Old French word 'restreindre,' and eventually became the modern English word 'restrain' through Middle English.

Initially, it meant 'to bind back or hold back,' and over time it evolved into its current meaning of 'to control or moderate.'