renascence/riʹnays(ə)ns/ noun

• up to one's neck in
• up to one's (old) tricks (again)
• up top
• up to scratch
• up to snuff
• up to speed
• up to the elbows in/with
• up to the mark
• up-to-the-minute
• uptown
• upturn
• UPU
• UPVC
• upward
• upwardly mobile
• upward mobility
• upwards
• upwards/upward of
• upwind
• up with
• up yours
• Ur-
• ur-
• uracil
• uraei