In tennis, a "let" is a term used when a ball that would have otherwise been good is hindered by the net before it crosses over. The term has an interesting etymology. Some sources suggest that the word "let" in tennis may have originated from the French word "filet," which means "net." When the English adopted this term, they used it as "let," which implies that the ball was stopped or hindered by the net. Another theory is that "let" comes from an Old English verb meaning "to hinder," which aligns with the idea that the ball was in some way obstructed by the net. In either case, a "let" call indicates that the point must be replayed without penalty to either player. read more >>

Some claim that the origins of "Let" in Tennis lies with the French word "filet" which translates to "net". The English borrowed this and used it as "let" instead. ... An Old English verb meaning "To hinder" which suggests the ball touched the net or was "hindered" by it.read more >>