till hell freezes over
Forever, as in They said they'd go on searching till hell freezes over, but I'm sure they'll give up soon. This hyperbolic expression dates from the early 1900s. So does its antonym, not till hell freezes over, meaning “never,” as in I'm not giving in, not until hell freezes over.
Words nearby till hell freezes over
tiliaceous,
tiling,
till,
till all hours,
till eulenspiegel,
till hell freezes over,
till money,
till the cows come home,
tillable,
tillage,
tillamook bay