赴汤蹈火 to go through fire and water
Explanation
比喻不避艰险，奋勇向前。
It means to venture into danger without hesitation.
Origin Story
汉景帝时期，晁错建议削弱诸侯势力，触怒了诸侯，父亲劝他保全自己，晁错却说：‘只有我们大家赴汤蹈火，才能保家卫国。’后被诸侯诛杀。这个故事说明了晁错忠于国家，不怕牺牲的精神。
During the reign of Emperor Jing of the Han Dynasty, Chao Cuo suggested weakening the power of the feudal lords, which angered them. His father advised him to protect himself, but Chao Cuo said: 'Only if we all go into danger can we protect our country.' Later, he was killed by the feudal lords. This story shows Chao Cuo's loyalty to the country and his spirit of self-sacrifice.
Usage
作谓语、状语；比喻奋不顾身。
As predicate, adverbial; it describes someone who selflessly dedicates themselves to something.
Examples
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为了国家，战士们赴汤蹈火，在所不辞。
weìle guójiā, zhànshìmen fù tāng dǎo huǒ, zài suǒ bù cí.
For the country, the soldiers went to their deaths without hesitation.
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面对危险，他毫不犹豫，勇敢地赴汤蹈火。
miànduì wēixiǎn, tā háo bù yóuyù, yǒnggǎn de fù tāng dǎo huǒ.
In the face of danger, he did not hesitate, bravely venturing into the fray.