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Ruhen vs. sich ausruhen vs. sich entspannen

The German verbs ruhen, sich ausruhen, and sich entspannen all translate to concepts of resting or relaxing. However, they are not interchangeable and each carries a distinct nuance regarding the state of inactivity, the recovery from exertion, or the release of tension.

Ruhen

B1
This verb means to rest in the sense of being in a state of stillness, quiet, or inactivity. It is often a passive state and can apply not only to people but also to objects, activities, or abstract concepts. It implies a cessation of movement or work.
Der See ruht still und friedlich in der Abendsonne.
(The lake rests still and peacefully in the evening sun.)
Der Arzt sagte, sein verletzter Arm müsse zwei Wochen ruhen.
(The doctor said his injured arm must rest for two weeks.)
Wegen des Feiertags ruht heute die Arbeit auf der Baustelle.
(Because of the holiday, the work on the construction site ceases today.)
Lass die Vergangenheit ruhen und blicke nach vorn.
(Let the past rest and look forward.)

Sich ausruhen

A2
This reflexive verb means to rest (oneself) or to have a rest. It describes the active process of taking a break to recover from physical or mental effort. The focus is on regaining strength and energy after being tired or exhausted.
Nach der langen Wanderung müssen wir uns ausruhen.
(After the long hike, we need to have a rest.)
Ich werde mich für eine halbe Stunde ausruhen, bevor ich weiterarbeite.
(I will rest for half an hour before I continue working.)
Du siehst müde aus, du solltest dich ein wenig ausruhen.
(You look tired, you should rest a little.)
Die Spieler ruhen sich in der Halbzeitpause aus.
(The players are resting during the halftime break.)

Sich entspannen

A2
This reflexive verb means to relax (oneself) or to unwind. The focus is on releasing mental and physical tension, stress, or anxiety. It's about achieving a state of calm, comfort, and well-being, often through an enjoyable activity.
Ein warmes Bad hilft mir, mich nach einem stressigen Tag zu entspannen.
(A warm bath helps me to relax after a stressful day.)
Im Urlaub möchte ich einfach nur am Strand liegen und mich entspannen.
(On vacation, I just want to lie on the beach and relax.)
Atme tief durch und versuche, deine Muskeln zu entspannen.
(Take a deep breath and try to relax your muscles.)
Wir hören leise Musik, um uns zu entspannen.
(We listen to soft music to relax.)

Summary

In short: use ruhen for a state of stillness or inactivity (like a resting lake or a project on hold). Use sich ausruhen when you actively take a break to recover from fatigue (like after sports or work). Use sich entspannen when you actively do something to relieve stress and feel calm (like taking a bath or reading a book).