1. Collapse caused by exposure to excessive heat
   - heatstroke

Type of: collapse, prostration

• backbreaking
• backchat
• backcloth
• backcomb
• backcross
• backdate
• backdoor
• backdown
• backdraft
• backdraught
• backdrop
• backed
• backer
• backfield
• backfile
• backfill
• backfire
• backflow
• backflowing
• backgammon
• backgammon board
• background
• background knowledge
• background level
• background music