LET (2)

let (2). Let, n. an hindrance, impediment, obstacle, stop

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Let, n. 1. 1. A retarding; hindrance; obstacle; impediment; delay; — common in the phrase without let or hindrance, but elsewhere archaic. Keats.
Consider whether your doings be to the let of your salvation or not. Latimer. 2. 2. (Lawn Tennis) A stroke in which a ball touches the top of the net in passing over.