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Now i know that 元気を出せよ。=Cheer up. But i have no clue what's going on in the
expression.

Here's my attempt to literally translate it with the help of Jisho.org:

元気を出せよ。=You can reveal/show full spirit/livelyhood, you know. Supposing that
出す is in potential.
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2020-07-30T23:17:16.490
78895
2020-07-31T02:44:36.733
39768
question
meaning expressions conjugations
What conjugation does出す/出せる take in this expression;元気を出せよ。?
This is not the potential form, it's the imperative / command form of 出す. The
form for issuing commands. For a godan verb like 出す, you change the final mora
to the equivalent え column character.

だす > だせ  
きく > きけ  
のむ > のめ  
はしる > はしれ  
さそう > さそえ

The final よ is the sentence-ending emphasis particle よ.

Jisho actually shows inflections of verbs. If you go to the entry for 出す and
click "show inflections" you'll see the imperative form at the bottom.
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2020-07-30T23:57:30.757
78896
2020-07-30T23:57:30.757
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answer
The **出す** is in it's imperative form(command form). according to [this
site](https://www.japanistry.com/the-imperative/) the **よ** at the end of the
sentence is helping to soften the use of the imperative.A bit more info can be
found on the site; I recommend checking it out as it goes over the basics of
imperative verbs quite extensively.

Here are two example sentences I pulled from Tangorin I hope this helps show
imperative vs. potential. [![enter image description
here](https://i.stack.imgur.com/h6yt3.jpg)](https://i.stack.imgur.com/h6yt3.jpg)

I hope I was able to help even just a little bit.
CC BY-SA 4.0
2020-07-31T02:44:36.733
79897
2020-07-31T02:44:36.733
33524
78895
answer