abort
https://support.chess.com/customer/en/portal/articles/1444922-fair-play-policy?b_id=12321
quoted from the above link:
Do not Abort games if your opponent will not move at the beginning of a game: The server will do it for you!
On his or her turn, each player has 15-20 seconds to make their first move. If this does not happen, the game will be automatically aborted. This has a negative effect on the Fair-Play record of the player failing to move. (But if you hit Abort, it affects your record! It's best to be patient for a few seconds.)