Definition of yellow perils:
(n) :
(historical, derogatory, offensive) The alleged threat to Western nations by East Asians, especially Chinese or Japanese people, due to their vast population, non-Western cultures, or supposed antagonism to the West.
(n) :
(historical, derogatory, offensive) East Asian nations or peoples, conceived as threatening.
(n) :
Alternative letter-case form of yellow peril. [(historical, derogatory, offensive) The alleged threat to Western nations by East Asians, especially Chinese or Japanese people, due to their vast population, non-Western cultures, or supposed antagonism to the West.]