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References in classic literature ?
As for De Griers, he spoke as though he had made up his mind to do something (though it is also possible that he spoke in this manner merely in order to hearten the General, with whom he appeared to have held a conference).
Laurie is as full of didoes as usual, and turns the house upside down frequent, but he heartens the girls, so I let em hev full swing.
1 : make more determined, hopeful, or confident : hearten <Cheering fans encouraged the team.