The phrase "letted fall" is an archaic form of the modern English phrase "let fall." It means to allow something to drop or descend. The word "letted" is the past tense of the verb "let." It is pronounced as "LET-id," with the "t" sound at the end being pronounced. The spelling reflects the Middle English origins of the word "let" and shows how the spelling of English words has evolved over time. Nowadays, the more commonly used past tense of "let" is "let" itself.
The phrase "letted fall" is not a commonly used expression in modern English. It appears to be an archaic or obsolete construction. The word "letted" is the past tense and past participle of the verb "let". In contemporary English, the word "let" is primarily used as a verb meaning to allow or permit. However, in older forms of English and in certain dialects, "let" also had the meaning of "to hinder" or "to prevent".
The word "fall" needs no explanation, as it refers to the act of descending or dropping from a higher to a lower position under the influence of gravity.
Putting the two words together, "letted fall" can be interpreted as an older form of the phrase "caused to fall" or "allowed to fall".