A punitive system measure the Syndicate can apply to a crawler that kills them and everyone nearby.
Orren lists Acceleration as the second of three options for resolving the problem of Carl holding the Gate of the Feral Gods. He states flatly that accelerating Carl will result in his death, along with the death of anyone near him, and lets the statement sit before offering the third option.
It is presented as a sanctioned alternative to confiscating the artifact, which the system will not permit — the rules protect crawler inventory, but they do not protect the crawler.
The Syndicate's lethal fallback for removing an inconvenient crawler.
Also appears in books you've already read — spoiler-safe to their endings: