| Knuckle-headed gestures of affection? |
| Knuckleballer Yoshida, currently the only professional woman pitcher in the U.S. (for the Chico Outlaws) |
| Knucklehead |
| Knuckle-dragging sorts |
| Knuckleheads |
| Knuckle-headed delivery? |
| Biting fingernails and cracking knuckles |
| Knuckleheaded |
| Teasing knuckle rub |
| Biting fingernails or cracking knuckles |
| Knuckle dragger |
| Knuckle-head move? |
| Cause of white knuckles |
| Knuckle-headed action? |
| Knuckleballer Phil |
| Knuckles under |
| Bare-knuckle, as politics |
| Knuckleball catcher |
| Knuckle under |
| Knuckleheaded blunder |
| Knuckle-headed antic? |
| Lovable knucklehead |
| Head knucklehead |
| Knuckle sandwich |
| Knuckle ball legend Wilhelm |
| DiFranco with the 2005 album "Knuckle Down |
| Hip or knuckle |
| Knuckle-walking beast |
| Word with war or knuckle |
| Hall of Fame knuckleballer Wilhelm |