Possible Clues:

• A log may have one
• Ecdysiast's move
• The swelling to jolt
• Fist ___ (modern greeting)
• Swelling caused by a blow perhaps
• Road flaw
• Yokel's relatives missing. What a blow!
• Dislodge, so to speak
• Traffic slower
• Dislodge hobo sitting on top of pillar