What is the antonym of synonym accelerate?

The antonym of "accelerate" depends on the context, as it has several meanings:

If "accelerate" means "to increase speed," then its antonym is decelerate or slow down.

If "accelerate" means "to speed up a process," then its antonym could be delay or hinder.

If "accelerate" means "to cause something to happen sooner," then its antonym could be postpone or delay.

Therefore, the most appropriate antonym for "accelerate" depends on the specific context.