To keep out is to stop somebody or something entering. A fence, a door, or a sign saying exactly that.
It splits round an object, and it works as a blunt instruction, since keep out on a gate is not a request. It also covers weather and cold, since curtains keep out draughts. There is a reflexive use about involvement, and keeping out of an argument means declining to take part, which is often the wisest available option.
Practised in A Man Called Ove, A Song of Ice and Fire
First appears in chapter 10 of A Man Called Ove.
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