Russian ⇄ English

уменьшаться в четыре раза stresses
gen.	quarter (Use all the settings as before but reduce the colours to 128; you will see the file size has almost quartered. Alexander Demidov)
уменьшать в четыре раза
Makarov.	quarter; reduce to one-fourth of its original size; reduce to one-quarter of its original size; reduce to one-fourth (of its original size); reduce to one-quarter (of its original size)