Simple past tense and past participle of hot.(verb)
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Use "hotted" in a sentence
"Under 15: THE race for the Division One title hotted up on Sunday with the two chief protagonists both picking up important wins."
"Until the war “hotted up” she recounted tea dances (Including one where she was asked to dance by Eddie Rickenbacker — “He was a bit full of himself”), baseball games, “flickers”, and picking strawberries."
"In an interview with the New Statesman last week, Alexander put his foot down again as the coalition wars hotted up."