The idiom 力挽狂澜 is formed by combining four characters: 力 (strength), 挽 (to pull back), 狂 (wild), and 澜 (big waves). Literally, it means "to use strength to pull back wild waves", creating a direct image of forceful intervention against turmoil. This construction derives from classical Chinese texts where the phrase metaphorically represents making a vigorous effort to avert a crisis or turn around a perilous situation.