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скучивание n stresses
astr.	clustering (галактик)
avia., med.	crowding
biol.	huddling behavior
ethol., Makarov.	huddling
Gruzovik, bacteriol.	clumping
Gruzovik, mil.	boxing up; bunching
Makarov.	piling-up (об осадках)
mil.	bunching-up
mil., arm.veh.	knotting

скучивание: 5 phrases in 2 subjects

Astronomy	4
Sports	1