as slippery as a pike

Translations
скользкий как щука
Be careful with him, he's as slippery as a pike.
Будь осторожен с ним, он скользкий как щука.
Definitions
This phrase refers to someone or something that is very difficult to catch, hold onto, or pin down, often due to being evasive or elusive, similar to how a pike fish can be hard to grasp due to its smooth, slimy skin.