Opened up throttle denotes the increase in the speed or intensity of an action, often in a positive way, such as accelerating in a car race or ramping up production in a factory. Antonyms for Opened up throttle could be slowing down, decelerating, halting, reducing, or easing off. Such antonyms can be applicable in situations where slowing down or reducing pace is desirable, like in safe driving, managing workload, or managing situations cautiously. Opened up throttle antonyms are also used figuratively to indicate a decrease in intensity or fervour, such as in lowering the volume in a conversation or easing off the demands. The choice of antonyms for the term "opened up throttle" depends upon the context of usage.