1. To append or attach a conclusion or final part to something, such as a story, film, or text
The director decided to add an ending that would satisfy the audience.
O diretor decidiu adicionar um final que satisfaria o público.
2. In grammar, to attach a suffix or inflectional morpheme to a word stem
In English, you add an ending to 'walk' to create 'walked'.
Em inglês, você adiciona um final a 'walk' para criar 'walked'.