Currently ruling or holding a position.(adjective)
Present participle of reign.(verb)
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Use "reigning" in a sentence
"I mean, who knows what calamities await us if we “go too far” in reigning them in."
"HMOs have done a decent job in reigning in health care inflation, at least until recently."
"Since Sen Mitchell and the GOP do not want govermental intervention in reigning in the "evil doers" in the banking sysytem who do the GOP want to assume the role?"