Real Dictionary

step down
phrasal verb: If someone steps down or steps aside, they resign from an important job or position, often in order to let someone else take their place.

step down in American English
to lower or decrease by degrees
to resign or abdicate (from an office, position, etc.)

step down in British English
to reduce gradually
adjective: (of a transformer) reducing a high voltage applied to the primary winding to a lower voltage on the secondary winding
noun: a decrease in quantity or size

step-down in American English
a decrease, as in amount, intensity, etc.
that steps down, or decreases
adjective: serving to reduce or decrease voltage

step-down in British English
adjective: (of a transformer) reducing a high voltage applied to the primary winding to a lower voltage on the secondary winding
noun: a decrease in quantity, size, etc

step-down in Electrical Engineering
adjective: A step-down transformer reduces a high voltage applied to the primary winding to a lower voltage on the secondary winding.