iceberg

noun

• (obsolete) The seaward end of a glacier. [:Template:SAFESUBST:–Template:SAFESUBST: c.]
• A huge mass of ocean-floating ice which has broken off a glacier or ice shelf [from Template:SAFESUBST: c.]
• (US, slang) An aloof person. [from Template:SAFESUBST: c.]
• (figuratively, after an adjective) An impending disastrous event whose adverse effects are only beginning to show, in reference to one-tenth of the volume of an iceberg being visible above water.