Wiktionary
turn on a dime
vb. (context intransitive US English) to have a small turning circle
WordNet
turn on a dime
v. have a small turning radius; "My little subcompact car turns on a dime!"
Usage examples of "turn on a dime".
The dragon was now beyond them, being unable to turn on a dime in mid-dive.
Grandma doesn't turn on a dime conversationally, and besides, those stiff old-lady corneas take a little while to shift focus.
The plane could climb, dive and turn on a dime- and pull 9gs white it was doing it.