A thick, sweet syrup drained from sugarcane, especially (Canada, US) the still thicker and sweeter syrup produced by boiling down raw molasses.
Anything considered figuratively sweet, especially sweet words.
Any similarly thick and sweet syrup produced by boiling down fruit juices, tree saps, etc., especially concentrated maple syrup.
A syrupy byproduct of sugar refining; molasses or golden syrup.
Sweetheart (from treacle tart).
Cloying sentimental speech.
To apply treacle to a surface, so as to catch flies or moths, etc.