ETYM French aborder. Related to Abord.
1. To get on board of (trains, buses, ships, aircraft, etc.); SYN. get on.
2. To live and take one's meals (in a certain place); SYN. room.
3. To lodge and take meals (at).
4. To provide food and lodging (for).
board over / ˈbɔːrd ˈoʊvr̩ /
board up / ˈbɔːrd ʌp /
To cover with wooden boards; as of windows, for example.