1. to experience or be subjected to something, especially something unpleasant or difficult
2. to be changed by a process or treatment

Examples

• The patient will undergo surgery next week.
• She had to undergo extensive training before starting the job.
• The building underwent major renovations last year.
• All applicants must undergo a background check.
• The company underwent significant changes after the merger.
• He underwent chemotherapy for six months.
• The metal undergoes expansion when heated.