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учетверять v stresses
gen.	fourfold; quadruplicate; quadriplicate
math.	quadruple
учетверяться v
gen.	increase fourfold; quadruple; quadruplicate; go up four times
Gruzovik	increase fourfold (impf of учетвериться)
учётверять v
mil., avia.	quadruple; quadruplicate

учетверять: 2 phrases in 1 subject

Mathematics

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