The correct spelling of "pleading fors" is actually "pleading voice". The confusion may arise due to the similar sound of "f" and "v". In IPA phonetic transcription, "pleading voice" would be written as /ˈpliːdɪŋ vɔɪs/. The "f" sound in "fors" would be represented as /f/, while the correct "v" sound in "voice" is represented as /v/. It's important to pay attention to the nuances of pronunciation to ensure proper spelling.
The phrase "pleading for" does not have a specific etymology as it is a combination of two separate words. However, the word "pleading" can be traced back to the Old French word "plaitier", which meant "to speak (in court)" or "to make a legal plea". It ultimately originated from the Latin word "plangere", which means "to lament" or "to bewail". The preposition "for" has its roots in Old English and is derived from the Germanic word "für". It expresses a purpose or intention. Combining these two words gives the meaning of making a heartfelt request or appeal.