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The idiom "by word of mouth" has ancient origins and reflects the traditional way information was passed from person to person in oral cultures before the widespread use of written language. It dates back to a time when people relied on spoken communication to convey news, stories, and knowledge. This expression is used to describe the transmission of information, rumors, stories, or knowledge through spoken communication rather than through written documents or formal channels.

The idiom "last word" does not have a specific origin, but it signifies having the final say or the most significant opinion on a topic. It carries the sense of ultimate authority or the conclusive statement about something. People use this phrase to assert that their opinion or decision is the final and most important one on a particular matter.

The origin of the idiom "put in a word for someone" can be traced back to the idea of using words as a form of influence or recommendation. It likely emerged from the practice of people using their spoken or written words to vouch for someone's character or abilities. In social and professional contexts, individuals would verbally advocate for others, emphasizing their qualifications or suitability for a particular role or opportunity. This phrase is typically used in various contexts and occasions where one person seeks to support or assist another person by recommending them to their acquaintances.

The idiom "say the word" traces its origin to the concept of verbal commands and their immediate impact. The phrase highlights the anticipation and eagerness of the person addressed, poised and ready to act upon receiving the designated word or directive. It is often used to express a strong desire to help someone or to emphasize one's availability and eagerness to act on their behalf.

The idiom "a man of few words" arose in the early 17th century, likely based on the concept that a quiet and reserved person tends to speak less. It is used to describe someone who speaks sparingly or prefers to communicate concisely. It can be used to refer to individuals who are quiet or reserved in their speech, or to highlight someone's ability to express themselves effectively with minimal words.

The idiom "lost for words" originated from the idea that when someone is truly surprised, shocked, or overwhelmed by an event or situation, they may be unable to find the right words to express their thoughts or feelings. It is used to describe a moment of speechlessness. In various contexts, it can denote a lack of vocabulary to describe something or even indicate a moment of profound emotional impact.

The idiom "mince one's words" has its origins in the idea of carefully choosing words and speaking with delicacy or subtlety, often to avoid being too blunt or direct. It implies that a person is being considerate in their communication, typically by using a more measured or indirect approach. This phrase is often used when someone is offering a sensitive opinion, critique, or feedback and doesn't want to be overly harsh or confrontational.

This idiom "not know the meaning of the word "likely stems from the idea that when someone is completely unfamiliar with a concept or word, it might as well be in a foreign language or dialect. This expression is used when people want to highlight that someone is so unfamiliar with a topic that they cannot even comprehend basic terms associated with it.