challenge - issue a challenge to; "Fischer challenged Spassky to a match"

action, sue, litigate, process - institute legal proceedings against; file a suit against; "He was warned that the district attorney would process him"; "She actioned the company for discrimination"

challenge - issue a challenge to; "Fischer challenged Spassky to a match"

expedite - process fast and efficiently; "I will try to expedite the matter"

litigate - engage in legal proceedings