last word
Synonym discussion
Sense: noun/1
While 'the last word' and 'final say' both describe having the concluding input, they differ in tone and setting. 'The last word' suggests a personal conversation where one person insists on speaking last, often in casual or domestic arguments. 'Final say' implies recognised authority — a boss, judge, or committee chair who makes the binding decision regardless of who spoke most recently. A 'parting shot' is a sharp, often hurtful remark delivered as someone exits, meant to wound rather than to win a debate. A 'closing argument' belongs to formal settings such as trials or structured debates, where each side gets a designated final statement. A teenager may slam her door and shout a parting shot; her father may later have the last word at dinner. A board chair, by contrast, holds the final say on spending no matter how long the discussion lasted.
Etymology
The phrase 'last word' combines 'last' (final) with 'word' (unit of speech). Its earliest use, dating from the early 19th century, referred to having the final utterance in a dispute — the person who speaks last appears to win. The meaning 'final authority or power to decide' emerged in legal and administrative contexts by the late 19th century. The sense of 'the most fashionable or advanced example' developed in the early 20th century, likely from the idea that the latest thing has the final say on what is current.
First known use
1509
1509, in the meaning defined at sense 1