exacerben
Exacerben is the third-person plural present subjunctive form of the Spanish verb exacerbar, meaning to make something worse or more severe. In addition to its use in subordinate clauses, it can serve as a formal affirmative command when addressing a group (ustedes) in contexts where the present subjunctive is employed for instructions or requests.
Exacerben appears in sentences expressing doubt, possibility, desire, emotion, or necessity, often after verbs or expressions
The verb exacerbar comes from Latin exacerbāre, meaning to make more severe or bitter, with subsequent evolution