1. the end of a romantic relationship
2. the division or dissolution of something into smaller parts
3. the breaking apart of ice on a body of water in spring

Examples

• Their breakup was difficult for both of them.
• She moved to a new city after the breakup.
• The breakup of the Soviet Union occurred in 1991.
• The company announced the breakup of its largest division.
• The spring breakup on the river happens in April.
• Ice breakup can cause flooding in some areas.
• The breakup of the band surprised their fans.