In Spanish slang, 'cangrejo' literally translates to 'crab', but it can be used in a colloquial context to refer to a person who is not making progress, who is stuck in one place or going backwards.
Examples
- Spanish: Juan es un cangrejo, siempre está en el mismo lugar y nunca avanza en la vida.
- English: Juan is a crab, he's always in the same place and never makes progress in life.