(British) a hole into which a plug fits (especially a hole where water drains away)

• Advertise GAP outlet
• Drain source of pus above ear

Wiktionary Word definitions in Wiktionary
alt. (context chiefly AU NZ British English) The hole at the bottom of a bath, sink or tub, which can be blocked using a plug. n. (context chiefly AU NZ British English) The hole at the bottom of a bath, sink or tub, which can be blocked using a plug.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Between her feet, water swirled down the plughole , taking red and black threads of blood and dirt with it. ▪ Down the plughole with it, this little glob of potential life, this putative devourer of the world's resources! ▪ Faced ...

WordNet Word definitions in WordNet
n. a hole into which a plug fits (especially a hole where water drains away)