What is "hanging up"

vb. (present participle of hang up English)

Hanging Up is a 2000 American comedy-drama film about a trio of sisters who bond over the approaching death of their curmudgeonly father, to whom none of them were particularly close. This film features Diane Keaton (who also directed), Meg Ryan, and Lisa Kudrow as the three sisters, and Walter Matthau (in his final film appearance) as the father. The film is based on 1995 Book of the same name by Delia Ephron.