Mudcat Café message #1943791

The Mudcat Café ^TM
Thread #98190 Message #1943791
Posted By: Jim Dixon
21-Jan-07 - 09:50 PM
Thread Name: Lyr Req: Promise Tonight (Quicksilver)
Subject: RE: Lyr Req: Promise Tonight (Quicksilver)

There seems to be some British idiom here that I don't understand. What does it mean to be "on a promise"?