In billiards, this what British people call a ball sitting directly in front of the pocket. In the states we call it a duck. When attempting to sink a sitter, you sometimes want to strike the cue ball with low english to avoid scratching.
Sit"ter (?), n.
1.
One who sits; esp., one who sits for a portrait or a bust.
2.
A bird that sits or incubates.
© Webster 1913.
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