One of the mysteries of the English language finally explained.
1In plural"on hot bricks": in a state of anxiety, agitation, or restlessness. Chiefly in similative phrase "like a cat on hot bricks".
2In similative phrases, as "to drop (a thing or person) like a hot brick": = "hot potato".
Mid 19th century; earliest use found in Female Freemasons. From hot + brick.
hot brick/ˌhɒt ˈbrɪk/
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