to endure / withstand
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to endure
To bear something unpleasant such as pain, noise, heat, or a difficult situation without giving up or breaking down.
Ich weiß nicht, wie du es in diesem lauten Büro aushalten kannst.
I don't know how you can endure it in this noisy office.
'Aushalten' (to endure/withstand) is a separable verb with the prefix 'aus-'. In a main clause, 'aus' comes at the end. The prefix emphasizes that you get through a situation until the end.
Ich halte diesen Lärm keine Minute länger aus!
I can't endure this noise for one more minute!
The object reveals the meaning: If it is something unpleasant (noise, pain), it means 'ertragen' (to endure). If it is a physical force (weight, pressure), it means 'standhalten' (to withstand). If it is a person, it means 'finanziell versorgen' (to support financially).
Kannst du die Hitze in diesem Raum aushalten?
Can you endure the heat in this room?
In the meaning of 'ertragen' (to endure), what you endure is always in the accusative. A very common phrase is 'es nicht mehr aushalten können' (to not be able to stand it anymore).
Er konnte den Schmerz nicht länger aushalten.
He could no longer endure the pain.
The meaning 'jemanden finanziell versorgen' (to support someone financially) often has a negative connotation. It implies that the person being provided for does not work and is dependent on the other person.
Er prahlte damit, dass seine Freundin ihn aushält.
He bragged that his girlfriend supports him.
to suffer
'leiden' and 'aushalten' can both be used for unpleasant experiences. 'leiden' describes someone experiencing pain, sorrow, or hardship. 'aushalten' emphasizes getting through something unpleasant such as noise, heat, pain, or stress. 'aushalten' often sounds more practical and concrete: it is about whether you can still manage the situation. 'leiden' sounds more like the state of being affected. If you want to describe the pain or burden itself, 'leiden' fits. If you mean that someone can still get through the burden, 'aushalten' fits.
Den Lärm von der Baustelle halte ich heute kaum aus.
I can hardly stand the noise from the construction site today.
Viele Menschen leiden im Sommer unter der großen Hitze.
Many people suffer from the intense heat in summer.