Afterclap

an unexpected repercussion.
Historical Examples

Suddenly the hideous consequences of it all, the afterclap, sounded in their ears.
The Debtor Mary E. Wilkins Freeman

The War of 1812 has been called by an able historian “the afterclap of the Revolution.”
An Account Of The Battle Of Chateauguay William D. Lighthall

Its afterclap of 1812 displayed little but empty bombast and greed.
An Account Of The Battle Of Chateauguay William D. Lighthall

afterclap, aft′ėr-klap, n. an unexpected event happening after an affair is supposed to be at an end.
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various

This is a sort of afterclap you little expected, but I cannot possibly afford them at a cheaper rate.
The Works of William Cowper William Cowper

It is the afterclap that keeps the people off the Gipsies, and secures for them a sort of toleration wherever they go.
A History of the Gipsies Walter Simson

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After-dinner
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Aftereffect
a delayed ; an that follows at some interval the stimulus that produces it. Medicine/Medical. a result appearing the first due to an agent, usually a drug, has gone. noun any result occurring some time after its cause (med) any delayed response to a stimulus or agent Compare side effect (psychol) any illusory sensation caused […]