Ease off is a phrasal verb that means to reduce the intensity, severity, or pressure of something. Antonyms for ease off include intensify, worsen, aggravate, exacerbate, amplify, heighten, escalate, and increase. These antonyms denote the opposite of easing off and suggest a buildup of intensity, pressure, or severity. For instance, if a headache worsens, it becomes more intense and severe. Similarly, if a storm intensifies, it becomes more powerful and dangerous. In summary, antonyms for ease off connote a state of escalation or aggravation, rather than one of relief or relaxation.