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предостерегать v stresses
gen.	warn (with от, against); admonish (от чего-либо); forewarn; tip; previse; exhort; monish; put on his guard (кого-либо); speak to; exhort someone not to do something (bigmaxus); put on guard (against); tip someone off (кого-либо В.И.Макаров); premonish; put somebody on his guard (кого-либо); caveat (mrssam); advertise; provide; caution (against)
Gruzovik	caution against (impf of предостеречь); put on one's guard against (impf of предостеречь)
Игорь Миг	send a message (см. put on notice); warn away
idiom.	cry havoc (to warn: The New York Times Cries Havoc as the U.S. House to Vote on Defunding ObamaCare.)
inf.	shout up (криком, окликом)
Makarov.	caution against; admonish against; admonish of; put on one's guard against (от); tip (кого-либо); warn against (от); warn of
math.	notify
media.	warn
nautic.	guard
navig.	caution
obs.	foreadmonish; foreadvise; prewarn
shipb.	caution it
slang	crawl
tech.	give notice
textile	precaution
предостерегаться v
gen.	provide; caution (against); put on guard (against); warn (against)
предостерегать кого-л. v
busin.	warn smb about smth (о чем-л.)

предостерегать : 30 phrases in 6 subjects

General	15
Idiomatic	2
Makarov	9
Mass media	1
Patents	2
Psychology	1