subs. (colloquial).—A decline in circumstances; a come-down.

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  1866.  The London Miscellany, 3 March, 57, 3, ‘London Revelations.’ Bug-hunting (robbing drunken men) was about the best game out, and he added, ‘I don’t think that’s no little LET-DOWN for a cove as has been tip-topper in his time, and smelt the insides of all the coops in the three kingdoms.’

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