Definition
To buy something on tick means to purchase it with an agreement to pay for it at a later time.
（英國）賒購，賒帳
As he was short of cash, he had to buy some groceries on tick.
因為他缺錢，所以不得不賒購一些食品雜貨。
The shop allows regular customers to buy goods on tick.
這家店允許老顧客賒帳購買商品。
Many families relied on buying on tick during the tough economic times.
在經濟困難時期，許多家庭依賴賒購。