'colloquialism' originates from Latin, specifically the word 'colloquium,' where 'col-' meant 'together' and 'loqui' meant 'to speak.'

'colloquium' transformed into the English word 'colloquial,' and eventually became the modern English word 'colloquialism.'

Initially, it meant 'a conversation or dialogue,' but over time it evolved into its current meaning of 'informal language or expression.'