One-Tack Mind# T# q2 y* {' t" M+ g
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Meaning: Tendency to think about only one subject 9 h; F5 A6 o2 q: E c8 |2 B8 S w* H4 o, f
Example% m' n/ B' O7 y2 _
) N, T$ E* O! I, `+ sMy son has a one -track mind these days. He thinks only about cars.