Casual and Friendly:
* Chill out: This is a very common and versatile term.
* Take it easy: A classic phrase, often used to advise someone to calm down.
* Unwind: Suggests letting go of tension and stress.
* Kick back: Implies lounging and enjoying oneself.
* Hang loose: A more laid-back phrase, suggesting a carefree attitude.
* Loosen up: Encourages someone to become less tense or formal.
* Take a chill pill: Humorous way to suggest calming down.
* Just chill: A short and simple way to say "relax."
* Zone out: Implies disconnecting from the world and simply relaxing.
More Informal and Playful:
* Lay back: A more informal way to suggest relaxing.
* Get comfy: Suggests getting into a comfortable position.
* Put your feet up: A classic phrase for relaxing at home.
* Take a break: Implies pausing from something stressful.
* Do nothing: Humorous way to suggest relaxing completely.
More Formal and Professional:
* Decompress: Suggests releasing stress and tension.
* Rejuvenate: Implies regaining energy and vitality.
* Disengage: Suggests disconnecting from work or a stressful situation.
Context-Specific:
* Couch potato: Implies relaxing by watching TV.
* Binge-watching: Implies relaxing by watching a lot of TV.
* Netflix and chill: Implies relaxing and watching movies.
* Sleep in: Implies relaxing by sleeping longer than usual.
The best slang word to use will depend on the specific context and your relationship with the person you're speaking to.