Analysis:? If a fish leaves water, it will only die. The homonym of death here is 4.
Fish is the oldest vertebrate. They inhabit almost all aquatic environments on earth-freshwater lakes, rivers, saltwater seas and oceans. Fish is a kind of aquatic vertebrate with variable temperature, and its whole body is covered with bone scales. It feeds on the upper and lower jaws through gill breathing, tail and trunk swinging and coordinated fin swimming.
Like a duck to water: it means getting water like a fish. It is a metaphor to get a person who is congenial to you or an environment that suits you very well.