LEARNit Dictionary
training wheels
noun
/ˈtreɪnɪŋ wiːlz/
UK
/ˈtreɪnɪŋ wiːlz/
US
1
small wheels that are fitted at each side of the back wheel on a child’s bicycle to stop it from falling over
چرخهای کمکی, چرخهای تعادل