go off the boil

Verb

 * 1)  To cease to boil when heat is no longer applied.
 * 2)  To lose interest; to pall.
 * 3)  To become of diminished intensity or urgency.
 * 4)  To become less successful.
 * 1)  To become of diminished intensity or urgency.
 * 2)  To become less successful.
 * 1)  To become of diminished intensity or urgency.
 * 2)  To become less successful.
 * 1)  To become of diminished intensity or urgency.
 * 2)  To become less successful.