出る
de-ru
Why a fever comes out in Japanese
The picture Something that was inside crosses the edge and shows up on the outside. 出る crosses the edge outward; 入る crosses that same edge inward.
Where the picture shows up in 出る
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The body goes out the door
七時に家を出ます。
shichi-ji ni ie o de-masu
I leave home at seven.
A hand pushes the front door and the body steps over the threshold onto the street.
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A vehicle pulls away
電車はもう出ました。
densha wa mō de-mashita
The train has already left.
The train slides past the end of the platform and out of the station.
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Out from inside the body
熱が出たので今日は休みます。
netsu ga deta node kyō wa yasumi-masu
I have a fever, so I am off today.
Heat that was pooled inside the body seeps out onto the forehead.
English says a fever comes on; Japanese pictures it coming out of the body.
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A hidden answer surfaces
検査の結果が出ました。
kensa no kekka ga de-mashita
The test results are in.
A number folded up inside an envelope unfolds onto the paper where you can see it.
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Showing up in front of people
店長がテレビに出ます。
tenchō ga terebi ni de-masu
The store manager is going to be on TV.
Someone standing behind the curtain walks forward onto the stage where everyone can see.
All of it in one picture
出る is one arrow pointing outward. Cross the threshold and you leave; roll past the platform and the train is gone; let heat seep out of the body and you have a fever; unfold the hidden number and the result is in; walk out from behind the curtain and you are on TV. So anything with 出る carries the same feeling: what was inside the edge has crossed it and is now in plain sight.