UNDERWAY
underway, afoot(p)
(adjective) currently in progress; “there is mischief afoot”; “plans are afoot”; “preparations for the trial are underway”
Source: WordNet® 3.1
Etymology
Noun
underway (plural underways)
A road, track, path, or street for going under another way or obstacle.
An underground passage, tunnel.
A voyage, especially underwater.
Adverb
underway (comparative more underway, superlative most underway)
In motion, in progress; being done or carried out; on a journey.
Source: Wiktionary