The expression perder los estribos means to fly off the handle, to blow one's top or to go off the deep end. We use this expression when someone gets very angry and loses his or her temper and starts acting wildly and talking crazy. Sometimes, driven by anger, jealousy, a sense of injustice, or fear, a person may even act deranged, making a big scene.
Los estribos mantienen al jinete firme en la silla de montar.
Los estribos mantienen al jinete firme en la silla de montar.