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действовать осторожно stresses
gen.	take in a reef; act with discretion; proceed cautiously; watch steps; go undercover (Александр Рыжов); tread upon to tread lightly; act with caution; feel way; use a light touch (VLZ_58); take a conservative approach (The Oilers and Hurricanes took a conservative approach to the game and did not allow many clear-cut opportunities. VLZ_58); tread lightly; tread on eggs; play it safe (VLZ_58); play it close to the vest; play it safe
Игорь Миг	walk a careful line; proceed with caution
austral., slang	play it cool
dipl., inf.	pull a punch
fig.	feel one's way; tread carefully (You should tread carefully when buying tires because the right choice can affect their performance and how long they last. ART Vancouver)
idiom.	pussyfoot; dip a toe in the water (Вместо артикля может употребляться соответствующее притяжательное местоимение. VLZ_58); tread softly (There are cost overruns on the two projects that we are building in Denver, so we have to tread softly and learn from mistakes made in the past. ART Vancouver)
inf.	play it close to the vest (He likes to play it close to the vest. Val_Ships)
Makarov.	act cautiously; proceed with caution; tread warily; tread as on eggs
mech.eng., obs.	exercise care (напр. при выполнении какой-л. сложной работы)
polit.	tread the careful path (ssn)
slang	take it slow
действовать по отношению к кому-л., чему-л. осторожно
gen.	go easy with (sb., sth.)
действовал осторожно
gen.	acted wisely (AlexP73)

действовать осторожно: 6 phrases in 4 subjects

General	2
Idiomatic	2
Occupational health & safety	1
Slang	1