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тяжёлые потери stresses
gen.	heavy losses
dipl.	heavy casualties (в живой силе)
fin.	heavy loss
media.	sizable casualties (bigmaxus); substantial casualties (bigmaxus)
mil.	major casualties; heavy death toll (Alex_Odeychuk); severe losses (Andrey Truhachev); major losses (Andrey Truhachev); strong losses (Andrey Truhachev); substantial losses (Andrey Truhachev)
mil., lingo	bloody nose (MichaelBurov)
тяжёлая потеря
gen.	heavy loss
Gruzovik	bereavement
dipl.	severe loss

тяжёлые потери: 71 phrases in 6 subjects

Diplomacy	3
Figurative	1
General	9
Makarov	21
Military	34
Military lingo	3