What is Lose Your Marbles?
1.
Lose your marbles = lose one's mind, insanity, person who does not have common sense/wits.
"Lose your marbles"
I knew she'd eventually lose her marbles = I knew she'd eventually lose her common sense/rational mind
Have you lost your marbles?. Means the same as "Have you lost your mind"?
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When two people are at opposite ends of a table, width wise, and they take turns (3 each in alternating turns) to knock a penny (Either ..