Leaps into the breach is an idiom that indicates someone taking action in a difficult or dangerous situation. There are several synonyms to describe this act of bravery; firstly, jumps to the forefront denotes someone taking on the lead in a crisis. Secondly, springs into action implies acting swiftly and decisively. Thirdly, throws themselves into the fray signifies someone entering a situation without hesitation. Fourthly, takes the initiative means someone stepping forward to resolve a problem. Finally, rises to the occasion conveys someone going beyond their abilities to help in a challenging situation. All these synonyms capture the spirit of leaping into the breach, reflecting decisive action under pressure.