ertrinken
to drown
To die by suffocating in water or another liquid.
Ohne die schnelle Hilfe des Rettungsschwimmers wäre der Junge im See ertrunken.
Without the lifeguard's quick help, the boy would have drowned in the lake.

to drown
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to drown
To die by suffocating in water or another liquid.
Ohne die schnelle Hilfe des Rettungsschwimmers wäre der Junge im See ertrunken.
Without the lifeguard's quick help, the boy would have drowned in the lake.

The prefix 'er-' often indicates a final or fatal result of an action. 'Ertrinken' (to drown) follows this pattern, derived from 'trinken' (to drink), and describes death by liquid.
Viele Insekten ertrinken nach einem starken Regen in Pfützen.
Many insects drown in puddles after heavy rain.
Since 'ertrinken' (to drown) describes a change of state (from life to death), the perfect tense is always formed with the auxiliary verb 'sein' (to be).
Der Mann ist bei dem Bootsunfall beinahe ertrunken.
The man nearly drowned in the boating accident.
Whether the literal or figurative meaning is meant can be recognized from context. If the verb refers to a liquid such as water, it is literal. If it refers to an abstract concept such as work or worries, it is figurative.
Im kalten Wasser des Flusses ist ein Reh ertrunken.
A deer drowned in the cold water of the river.
In the figurative meaning, 'ertrinken' (to drown) is often combined with the preposition 'in' and abstract nouns. Common expressions are 'in Arbeit ertrinken' (to drown in work), 'in Schulden ertrinken' (to drown in debt), or 'in Selbstmitleid ertrinken' (to drown in self-pity).
Nach der Gründung ihrer Firma ertrank sie förmlich in Arbeit.
After founding her company, she was practically drowning in work.
to set / sink / perish
'ertrinken' and 'untergehen' can both have to do with water and danger. 'ertrinken' is used for people or animals that die in water because they can no longer breathe. 'untergehen' means that something sinks in the water and does not come back up, for example a boat or a ship. A person can 'im Wasser untergehen' (go under in the water), but that does not yet say for certain that they die. Learners easily confuse the words because both occur in accidents in water. The important point is: 'ertrinken' emphasizes death by water, while 'untergehen' emphasizes sinking.

Ohne schnelle Hilfe kann ein Mensch in tiefem Wasser ertrinken.
Without quick help, a person can drown in deep water.
Nach dem Sturm ist das kleine Boot im See untergegangen.
After the storm, the small boat sank in the lake.