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iceberg `noun` [ ˈʌɪsbəːɡ ]

• a large floating mass of ice detached from a glacier or ice sheet and carried out to sea.

Origin: late 18th century: from Dutch ijsberg, from ijs ‘ice’ + berg ‘hill’.

the tip of the iceberg

• the small perceptible part of a much larger situation or problem that remains hidden.
"the plastic that can be seen and cleaned from the shore is just the tip of the iceberg"

iceberg noun [ ˈʌɪsbəːɡ ]

the tip of the iceberg

iceberg `noun` [ ˈʌɪsbəːɡ ]