Humiliate is a good choice because it is a synonym for abase.
Here's why:
* Abase: To lower in rank, dignity, or esteem; to humiliate.
* Humiliate: To cause to feel shame or humiliation; to lower in dignity or self-respect.
By understanding that "abase" and "humiliate" are synonyms, you can infer that the word "abase" means to lower someone's standing or make them feel ashamed.