omertà or omerta /ō-merˈtə/

1. The Mafia code of honour requiring silence about criminal activities and stressing the disgrace of informing
2. A criminal conspiracy of silence

• upthunders
• uptick
• upticks
• uptie
• uptied
• upties
• uptight
• uptighter
• uptightest
• up-till
• uptilt
• uptilted
• uptilting
• uptilts
• uptime
• uptimes
• up to
• up to a point
• up to date
• up-to-date
• up to high doh
• up to no good
• uptook
• up to one's ears in
• up to one's neck