Definition: The word 'Posth' is a slang term used in the UK for "post" or "postscript". It originates from the British English phrase "postscript", which means an appendix to a book or document. In its purest meaning, it refers to the postscript of a letter that provides additional information about the original document. The word 'Posth' is commonly used in informal situations where someone has just finished writing something and they are looking for something similar in their writing or speaking style. It can also be used as an expression of surprise when someone reads a sentence and notices a little detail not included in it. In more formal contexts, the word "post" refers to any action that leaves a written record (e.g., publishing a book) or an oral communication (e.g., speaking on stage). In contrast, "postscript" is used primarily as a way of referring to something added after the original document has been completed.