1 (often foll. by from, against) keep (a person, thing, etc.) safe; defend; guard (goggles protected her eyes from dust; guards protected the queen).
2 Econ. shield (home industry) from competition by imposing import duties on foreign goods.
3 Brit. provide funds to meet (a bill, draft, etc.).
4 provide (machinery etc.) with appliances to prevent injury from it.
Etymology: L protegere protect- (as PRO-(1), tegere cover)
Useful english dictionary. 2012.