The episode title means "mother," but the definition misses the mark for audiences thanks to the (unintentional?) white savior imagery of Daenerys floating above the crowd of slaves in Yunkai. Thanks to those colonial undertones, you may not realise this is also the episode where Tywin Lannister reveals his role in the Red Wedding, where Arya makes her first kill in retaliation for the event, and where Jon Snow escapes the vengeful arrow of his wildling love, Ygritte.