[until all hours] {adv. phr.} Until very late at night. * […]

[until hell freezes over] {adv. phr.}, {slang} Forever, for an eternity. […]

[up a tree] {adv.} or {adj. phr.} 1. Hunted or chased […]

[up and about] or [around] {adv. phr.} Recovered and able to […]

[up and at them] 1. {adv. phr.} Actively engaged in a […]

[up in the air] {adj.} or {adv. phr.} 1. {informal} In […]

[up one's sleeve] or [in one's sleeve] {adv. phr.} 1. Hidden […]

[up to no good] {adv. phr.} Intending to do something bad; […]

[up to one's ears] {adv. phr.} Immersed in; covered with. * […]

[up to one's neck] {adv. phr.} Overwhelmed with; submerged in. * […]