Cavan were relegated to the bottom tier of the Allianz Football League after Wicklow earned a surprise 3-11 to 0-18 win over the reigning Ulster SFC champions at Pairc Tailteann.
A brace of goals from full-forward Seanie Furlong in the second-half were enough for the Garden County to secure their Division 3 status.
It means that Mickey Graham's men head into the opening defence of their Anglo-Celt Cup title against Tyrone next month with far from ideal preparation under their belts.
Just three years ago, Wicklow were beaten 2-16 to 1-5 by the same opposition.
Rory Gallagher's Derry succeeded in their bid to return to Division 2, beating Limerick 0-17 to 0-13 in today's promotion battle at Carrick-on-Shannon.
Offaly sealed promotion to join the Oak Leafers in the second division in 2021 thanks to Mark Abbott's late goal against 14-man Fermanagh.
At Pairc Ui Chaoimh, Cork survived relegation after a high-scoring 3-22 to 0-25 win over Westmeath kept them in the Division 2 ranks for another year.
The Rebels scored three second-half goals courtesy of Mark Collins, Luke Connolly and substitute Brian Hurley to down the unlucky Lake County who went in at the break 0-14 to 0-12 in front.
Westmeath will make the drop with their upcoming Leinster quarter-final opponents Laois who fell to a 2-19 to 2-12 defeat at the hands of Down in Newry.
Meanwhile, Mickey Harte's instant impact as Louth manager sees the Wee County promoted to Division 3 after beating Carlow 1-23 to 1-15.
Allianz FL Division 2
Relegated: Laois, Westmeath
Allianz FL Division 3
Promoted: Offaly, Derry
Relegated: Cavan and Longford or Tipperary
Allianz FL Division 4