dharna
Concise Oxford English Dictionary © 2008 Oxford University Press:
dharna /ˈdəːnə, -ɑː/
▶noun Indian a mode of compelling payment or compliance, by sitting at the debtor's or offender's door until the demand is complied with.
■ a peaceful demonstration.
– origin from Hindi dharnā ‘sitting in restraint, placing’.
'dharna' also found in these Oxford entries:

