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натуживать v stresses
gen.	strain; exert
Gruzovik, inf.	tighten (impf of натужить); tense (impf of натужить)
inf.	tense; stretch
натуживаться v
Gruzovik, inf.	strain oneself (impf of натужиться); make an effort (impf of натужиться); exert oneself (impf of натужиться)
inf.	make a supreme effort; bear down; exert oneself; make an effort