1. Lose an upright position suddenly
   - fall

Derived forms: fell down, falls down, falling down

Type of: change posture

• head rhyme
• head sea
• head shop
• head smut
• head start
• head teacher
• head tone
• head trip
• head up
• head voice
• head-in-the-clouds
• head-on
• head-shrinker
• head-to-head
• head-up display
• headache
• headache powder
• headachy
• headband
• headbanger
• headboard
• headbutt
• headcase
• headcheese
• headcount