tranquillizer or tranquilliser(NAmer tranquilizer) noun

• upset price
• upset the apple cart
• upshot
• upside
• upside down
• upside-down cake
• upsides
• upsilon
• upstage
• upstair
• upstairs
• upstanding
• upstart
• upstate
• up sticks
• upstream
• upstroke
• upsurge
• upswept
• upswing
• upsydaisy
• uptake
• up-tempo
• up the boohai
• up the creek