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... amicos, quando meritis eorum referre gratiam prohoberetur, quod unum...

Here are possible meanings: bring/carry back/again/home; move/draw/force back, withdraw; go back, return; report (on), bring back news; record/enter; propose/open debate; assign/count; give/pay back, render, tender; restore; redirect; revive, repeat; recall; "gratiam referre," give thanks."