1. Designed and carried out secretly or confidentially
   "has their under-the-table backing"
   - sub-rosa, behind-the-scenes

See also: covert

• double standard
• double standard of sexual behavior
• double star
• double stitch
• double stopping
• double take
• double talk
• double time
• double tongue
• double up
• double vision
• double-barreled
• double-barrelled
• double-bedded
• double-bitted ax
• double-bitted axe
• double-blind experiment
• double-blind procedure
• double-blind study
• double-bogey
• double-breasted
• double-breasted jacket
• double-breasted suit
• double-check
• double-chinned