The word "echeneididae" refers to a family of fish known for their unique feature: they have a sucking disk on their heads. This allows them to cling to other fish or even to boats (ships). These fish are sometimes called "remoras."
In more advanced discussions about marine biology or ecology, you might talk about the symbiotic relationship between echeneididae and larger fish, where the remoras benefit by getting food scraps, and the larger fish are not harmed.
There aren't specific idioms or phrasal verbs that directly relate to "echeneididae," but the concept of "clinging" or "holding on" can be metaphorically used in phrases like: - "Clinging to someone for support" (which can mean depending on someone in a difficult situation).
In summary, "echeneididae" describes a fascinating group of fish known for their ability to cling to other creatures or objects in the water.