There are several synonyms for the phrase "coming to a standstill," all of which mean a sudden cessation of activity or movement. One of the most commonly used phrases is "grinding to a halt," which emphasizes the gradual deceleration of motion until there is no more movement. "Stalling out" refers to a mechanical malfunction or engine failure, and "freezing up" can be used to describe a sudden state of paralysis or immobility. Other synonyms include "coming to a dead stop," "halted in its tracks," "brought to a stand," "motionless," "at a stand," and "stopped short." Each of these phrases describes a sudden and complete cessation of activity or motion.