Simple past tense and past participle of guest.(verb)
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Use "guested" in a sentence
"I'd have 'guested' if I could have arranged my diary."
"A special word for Wyre Davies, who 'guested' for us at scrum half."
"The "Parks & Recreation" star guested on "Chelsea Lately" on Wednesday night to talk about "Our Idiot Brother," the star-studded indie pic in which she plays the girlfriend of Zooey Deschanel, who is one of Paul Rudd's three put-upon sisters."