overboard

Short definition from Wiktionary

Adjective

1. 1
   Outside of a boat; in the water.

Adverb

1. 1
   Over the edge; especially, off or outside of a boat.
2. 2
   Excessively; too much.

Verb

1. 1
   To throw over the edge of a boat into the water.
2. 2
   To cover (a ceiling) with plasterboard to create a new surface.