Here it is used in a few different ways:
- Llevan 10 años juntos pero con muchísimos altibajos.
They've been together for 10 years but with plenty of ups and downs.
It can mean unevenness or bumpiness in general:
- El terreno en muchos pueblos está lleno de altibajos.
The road on many villages is very uneven.
…and also refers to a bump in the road or a setback:
- Tuve muchos altibajos en mi carrera profesional antes de encontrar mi actual puesto.
I had a lot of setbacks in my professional career before finding my current role.
This word of the day has been contributed by LAE Madrid, the leading Spanish academy in Madrid. Accredited by the Insitituto Cervantes, it offers Spanish courses for all levels and also has Spanish classes for kids and families.