What does “usher in” mean?
Native speaker’s answer
Rebecca
'Usher in' is a phrasal verb, meaning to make an activity or process begin. So, in this case, when Starbucks begins to sell Pumpkin Spice Lattes, they're signaling the beginning of fall. Ex: His policy ushered in a new era. Ex: Stephen Curry ushered in a new era of basketball.