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Related to throttle down: throttled back
1. To cause a vehicle to reduce in speed by decreasing the flow of fuel to the engine. A noun or pronoun can be used between "throttle" and "down" to specify what is being slowed down. The engineer throttled the train down to a stop so that the crew could begin unloading the cargo. You'll want to start throttling down the engine as you pull into the harbor.
2. Of a computer or component thereof, to begin operating with difficulty and at a lower speed or level of efficiency. After about 30 minutes, the computer gets really hot and then the CPU starts throttling down to about half speed. The network will automatically throttle down if too many people are using the Internet at once.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
throttle something down
to reduce the speed of an engine by adjusting the throttle. She throttled her engine down and came to a stop. She throttled down her engine.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.