Another way of telling some one to look out, "keep sketch" is a phrase popular in the East Coast of Ireland.
"Keep sketch for the cops while I skull tha' hippy with me can of crown"
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The art of asking one or more people to keep an eye out for an authority figure while you do something questionable or slightly illegal.
Especially popular with teenagers doing things like graffiti or stealing something from a garden, school, shop etc.
Group of lads are walking down the street when one sees an apple tree in a garden.
Tony :Hey lads keep sketch while I nick these apples.