

Keine Sorge, mit Schwimmweste kannst du nicht untergehen.
[ˈkaɪ̯nə ˈzɔrɡə, ˈmɪt ˈʃvɪmvɛstə ˈkanst ˈduː ˈnɪçt ˈʊntɐɡeːən.]
Don't worry, you can't go under with a life jacket on.
Bei dem Sturm drohte das Boot unterzugehen.
[ˈbaɪ̯ ˈdeːm ˈʃtʊrm ˈdroːtə das ˈboːt ˈʊntɐˌtsuːɡeːən.]
In the storm the boat was in danger of sinking.
Das alte Segelboot ist in der Nacht untergegangen.
[das ˈaltə ˈzeːɡl̩boːt ˈɪst ˈɪn deːɐ ˈnaxt ˈʊntɐɡəɡaŋən.]
The old sailboat sank during the night.
"untergehen" is in the lesson "Sports 1" (Level 23), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.