shilly-shally
Concise Oxford English Dictionary © 2008 Oxford University Press:
shilly-shally/ˈʃɪliʃali/
▶verb (shilly-shallies, shilly-shallying, shilly-shallied) be indecisive. ▶noun indecisive behaviour.
– derivatives
shilly-shallyer (also shilly-shallier) noun.
shilly-shallyer (also shilly-shallier) noun.
– origin C18: orig. as shill I, shall I, reduplication of shall I?
'shilly-shally' also found in these Oxford entries:

