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вступить в бой stresses
gen.	join battle; throw away the scabbard; come to blows; fall a-fighting
hist.	go out
Makarov.	give battle; enter a battle; measure swords; cross swords
mil.	join battle; engage; get into action; go into action; go into combat; move into action; join the fight (Alex_Odeychuk)
shipb.	join the battle

вступить в бой: 21 phrases in 5 subjects

Chess	1
General	8
Idiomatic	1
Makarov	7
Military	4