Cliff edge

1.

An abrupt and large transition from one state to another, either from the passing of time, or from a small change in an input which causes an unusually large change in an output.

2.

Disruptive negative effects resulting from such a change.

"Britain will seek a phased implementation [of Brexit changes] to avoid a 'disruptive cliff edge' when Britain eventually leaves the EU."

The Treasurer, February 2017, report on UK prime minister Theresa May's speech of January 2017.

See also

• Brexit
• Tax