уменьшать

см. тж. понижать; снижать; сокращать

The figure is scaled down.

Each additional ring lowers the number of hydrogens in the general formula by two.

The diameter of the suction pipe should be curtailed.

The number of the burners in operation must be cut down.

Inhibitors diminish corrosion.

Increase in pressure lowered (or reduced) the combined yield.

This trims (or reduces, or decreases) the size of the generator to 1 cu ft.

To demagnify the picture, ...

Источник: Русско-английский научно-технический словарь на Gufo.me