Gehenna /gi-henˈə/

1. The valley of Hinnom, near Jerusalem, in which the Israelites sacrificed their children to Moloch, and to which, at a later time, the refuse of the city was conveyed to be slowly burned
2. Hence hell (Bible)
3. A place of torment

• know what one is talking about
• know what's o'clock
• know what's what
• know where the shoe pinches
• know which side one's bread is buttered on
• know who's who
• knub
• knubbier
• knubbiest
• knubble
• knubbled
• knubbles
• knubblier
• knubbliest
• knubbling
• knubbly
• knubby
• knubs
• knuckle
• knuckleball
• knuckleballer
• knuckleballers
• knuckleballs
• knuckle-bone
• knuckle-bones