[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. * […]

[up to the last minute] {adv. phr.} Until the last possible […]

[Upsadaisy!] or [Upsee-daisy!] or [Upsy-daisy!] {adv. phr.} - A popular exclamation […]

[upside down] {adv. phr.} Overturned so that the bottom is up […]

[when hell freezes over] {adv. phr.}, {slang} Never. * /I'll believe […]

[when push comes to shove] {adv. phr.} A time when a […]

[where it's at] {adv. phr.}, {informal} That which is important; that […]

[while ago] {adv.} At a time several minutes in the past; […]