'grammar-focused' originates from the combination of 'grammar' and 'focused', where 'grammar' refers to the set of rules governing the structure of sentences, and 'focused' means concentrated on a particular subject.

'Grammar' comes from the Greek word 'grammatikē', and 'focused' is derived from the Latin word 'focus', meaning 'hearth' or 'fireplace'.

Initially, 'focused' meant 'concentrated on a central point', and this meaning has largely remained the same in modern usage.