'dry-clean-only' originates from the English words 'dry clean' and 'only', where 'dry clean' refers to a cleaning process using solvents instead of water, and 'only' indicates exclusivity.

'dry clean' combined with 'only' to form the modern term 'dry-clean-only', emphasizing the exclusive cleaning method for certain garments.

Initially, 'dry clean' referred to a specific cleaning method, and 'only' emphasized exclusivity. The combined term 'dry-clean-only' has maintained this meaning.