shadow
verb [ T ]
uk/ˈʃædəʊ/ us HR
to spend time with someone who is doing a particular job so that you can learn how to do it:
All trainees are expected to spend a week shadowing an experienced manager.
to behave in the same way or move in the same direction as something else:
The cost of goods and services will shadow the recent rise in oil prices.
shadow
adjective [ before noun ]
uk/ˈʃædəʊ/ us POLITICS
in the UK, used to describe a leading member of Parliament whose party is not in power but who would be part of the cabinet (= people who are in charge of a department and make the main decisions) if their party were in power:
the shadow Foreign Secretary