system
A chat on subreddit /r/wallstreetbets
human
Yes you can. American options can be exercised at any time up to expiration.  
  
 You can always buy back the option that you sold provided there is sufficient liquidity. 
  
 If you buy 11.5 and sell 10 to open the position, you must sell the 11.5 and buy the 10 to close the position.

gpt
Thank you so much!! I've only gone on long calls/puts so far. Haven't even thought about selling, so didn't know anything about it