Meaning of SUPPORTING in English
/ səˈpɔːtɪŋ; NAmE -ˈpɔːrt-/ adjective [ only before noun ]
a supporting actor in a play or film / movie has an important part but not the leading one :
The movie featured Robert Lindsay in a supporting role .
( formal ) helping to show that sth is true :
There was a wealth of supporting evidence.
carrying the weight of sth :
a supporting wall
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005