The word shallow has two opposing meanings: on the one hand "very shallow depth", on the other hand "very great depth". It is thus a Janus word (antonym).
A shallow (with privatory UN ) is an area of a body of water with little depth . This importance has been documented since the 10th century. The designation can also refer to the corresponding elevation in the water.
In shipping , a shoal is an area that poses a risk to shipping due to its shallower depth. In addition to the dangers of touching the bottom and getting stuck , a dangerously high swell can also form at shallows up to ground lakes . Shallows are often marked by floating sea marks. Dangerous shallows are also shown on nautical charts if their exact position is not yet known (see Vigia ).
The Pulaski Shoal Light lighthouse marked a shoal in the northeast of the Dry Tortugas
A very great depth is also referred to as a shoal (with increasing shallowness ). This meaning has only been documented since the end of the 18th century and was initially Upper German . The prefix un- has an accentuating and reinforcing effect, similar to the words vastness or vast sum ( augmentative formation ).
- Duden : Shallow
- Duden online: Prefix Un- , meaning 1.
- shoal. In: Digital dictionary of the German language .
- Duden online: Prefix Un- , meaning 4.
- Johann Christian August Heyse ; Karl Wilhelm Ludwig Heyse : Concise dictionary of the German language. Part 2, Magdeburg 1849, p. 1473 ( books.google.de ).