One word for “saying ‘Farewell’ to someone”

We have, for example, phrases like, “When I was greeting …” in which greeting is essentially shorthand for “saying ‘Hello’ to someone” derived from a related verb (to greet).

However, to my knowledge, English does not have a term for “saying ‘Goodbye’ to someone” despite all the related verbs (farewell, goodbye, etc.).

Are there any words which come close to fulfilling such a role? If not, is it due to an absence of such phrases in English's primary language influences (Germanic and Anglo-Francophone), or was it a phrase that existed in those contributing languages but failed to persist in Modern English?

Leavetaking (or leave-taking) is “The process of saying goodbye”. Wiktionary gives the following example:

The formal leave-taking ceremony of a diplomat can take all day [...]

According to google ngrams, recent usage of leave-taking has been about four times as frequent as that of leavetaking, with usage of the latter being five to ten times as high as that of farewelling.

Um, the single word for "say farewell" is farewell. This is English. You can use any word at all as a verb.

• Wiktionary:

  farewell (third-person singular simple present farewells, present participle farewelling, simple past and past participle farewelled)

  1. To bid farewell or say goodbye

     • 2009 February 9, Neil Wilson and staff writers, “Tributes for newsman Brian Naylor and wife, killed in fires”, Herald Sun:
       He farewelled viewers with a warm sign-off after each bulletin: "May your news be good news, and goodnight."

• Merriam-Webster:

  transitive verb
  chiefly Australian & New Zealand
  : to bid farewell to
  The retiring teacher was farewelled by the whole school at a special assembly.
  First known use: 1580

Not in particularly common use, but there is a present participle of farewell: "farewelling".

See, for example, "Farewelling troops at Lyttelton, 1940".