a false dawn

a false dawn

something which seems to show that a successful period is beginning or that a situation is improving when it is not
Usage notes: False dawn is the light which appears in the sky just before the sun rises in the morning.
His victory in the French Open proved to be a false dawn after he failed to win another title for the next five years.
See also: dawn, false
References in periodicals archive ?
RECENT rises in house prices are a false dawn and property values will sink again, claim researchers.
Hetal Mehta, senior economic adviser to ITEM, said: "Current stabilisation is a false dawn.
There's always the risk of a false dawn if players get over confident but we've seen no evidence of that on the training ground.
So let's be patient and realise it is not a false dawn but the start of an exciting period for Welsh rugby.
As such, while this recovery is genuine in terms of economic data, and is likely to continue while sentiment is positive, it is likely to be a false dawn if subjected to a destabilising event.
If we don't continue to work hard then it could just be a false dawn.