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решающий довод stresses
gen.	clincher; corker; settler; finishing stroke; Sunday punch; finisher; critical point; quietus
amer.	sockdolager
fig.of.sp.	knockout punch (Халеев)
law	close argument; closing argument
math.	stroke

решающий довод: 5 phrases in 4 subjects

American usage, not spelling	1
Diplomacy	1
General	2
Informal	1