1. a student who fails a course or exam
Usage: informal; common in educational contexts
2. a person who fails or performs poorly at something
Usage: informal; broader usage beyond academics

Examples

• He was a flunker in high school but later became successful in business.
• The flunker had to retake the math exam three times.
• She didn't want to be labeled a flunker after failing one test.
• Several flunkers were required to attend summer school.
• He was determined not to be a flunker and studied hard for the final exam.
• The flunker eventually dropped out of college.