One-Tack Mind ; C" W' G2 m/ O J2 [* s: a4 G * l5 w& k! h1 \% [( e% H q4 eMeaning: Tendency to think about only one subject ) o0 W. ^4 X2 z6 d2 v# T ! [) H' h9 P* w* W; AExample ! T. |7 v4 a( e' s $ R( d' N" `! a7 ~My son has a one -track mind these days. He thinks only about cars.