'abstainer' originates from the Latin word 'abstinere,' where 'ab-' meant 'away from' and 'tenere' meant 'to hold.'

'abstinere' transformed into the Old French word 'abstenir,' and eventually became the modern English word 'abstain' through Middle English.

Initially, it meant 'to hold oneself back from something,' and this meaning has largely remained the same in modern usage.