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терять сознание stresses
gen.	faint; lose consciousness; swoon; forget oneself; slip under (КГА); go under; pass out; lose consciousness (4uzhoj); black out; go off; go out; faint (4uzhoj)
amer., inf.	go out like a light
brit., inf.	flake out (В.И.Макаров)
Makarov.	faint away; become unconsciousness; blacken out
med.	die away; collapse (Andrey Truhachev)
reg.usg.	fading fast (Kate&Kate)
slang	go blooey; go kerflooie; whack out (Alex Lilo)
постепенно терять сознание
inf.	gray out (plushkina)

терять сознание: 9 phrases in 4 subjects

American usage, not spelling	1
General	4
Idiomatic	1
Makarov	3