[ bɔɪ ]
■ noun an anchored float serving as a navigation mark, to show hazards, or for mooring.
■ verb
1》 (usu. be ~ed up ) keep afloat.
↘cause (a price) to rise to or remain high.
2》 mark with a ~.
Derivatives
~age noun
Origin
ME: prob. from MDu. boye , boeie , from a Gmc base meaning 'signal'.