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iceberg

iceberg /ˈaɪsˌbɚg/ noun
plural icebergs
iceberg
/ˈaɪsˌbɚg/
noun
plural icebergs
Britannica Dictionary definition of ICEBERG
[count]
: a very large piece of ice floating in the ocean

the tip of the iceberg

: a small part of something (such as a problem) that is seen or known about when there is a much larger part that is not seen or known about