go off the boil

go off the boil 

1. (British & Australian) to become less successful After winning their first two matches this season, the French team seem to have gone off the boil.

2. (British) if a situation or feeling goes off the boil, it becomes less urgent or less strong The housing issue has gone off the boil recently, despite attempts to revive public interest. Our affair went off the boil when I discovered he was married.

See also: boil