Noun

1. Someone who pays for meals and lodging in a house rather than a hotel.

   When I left for college, my parents took on a boarder in my old room to help defray expenses.

2. A pupil who lives at school during term time.

   The student body consisted primarily of boarders, except for a few children belonging to the school staff.

3. A sailor attacking an enemy ship by boarding her, or one repelling such attempts by an enemy.

   The captain shouted at the crew to grab arms and repel boarders.