This is the 2351st most frequent Japanese word.
アウト
"Out" (loanword from English); can mean "out" in games, failure, or outside.
Here, 'アウト' is used in a sports context to indicate a player is out, such as being out of the play or losing participation in the game.
その試合では彼はアウトになった。
He was out in the game.
Here, 'アウト' is used to mean 'out' in the sense of disallowed or unfeasible in a colloquial way.
その計画はアウトだね、現実的じゃない。
That plan is out; it's not practical.
In this context, 'アウト' refers to 'exit' indicating a direction or purpose of movement outwards.