1. The four-character idioms for fighting the epidemic are: united as one, united as one, adversity and hardship, sharing the same boat through thick and thin, sincere unity, working together, pooling efforts, the whole country is united, working with one heart to save money, providing help in times of need, Compassion with brothers and sisters, strong iron walls, strict self-discipline, and self-discipline.
2. The original meaning of "united as one" is that everyone works together and is as strong as a city wall. It is a metaphor that if everyone unites as one, they can overcome difficulties; it is often used as a predicate and attributive in a sentence; it has a commendatory meaning.