skulduggery or (N American) skullduggery /skulˈ or skul-dugˈə-ri/

1. Underhand malpractices
2. Trickery

• opaquenesses
• opaquer
• opaques
• opaquest
• opaquing
• op art
• op cit
• opcode
• opcodes
• OPCW
• ope
• OPEC
• op-ed
• opeidoscope
• opeidoscopes
• open
• openable
• open access
• open-access
• open adoption
• open aestivation
• open-air
• open-and-shut
• open a person's eyes
• open-armed