Final answer:
The word 'forfeit' means to surrender or give up something. In the context provided, it implies a penalty where someone would lose fifty rupees if they moved.
Step-by-step explanation:
The word 'forfeit' as used in the sentence 'Anyone who moved would forfeit fifty rupees' means to surrender or give up something, in this case, fifty rupees. It does not mean to borrow, display or earn. When you forfeit something, you lose the right to it, often as a penalty for some kind of wrongdoing or failure to comply with a rule.