pin money

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˈpin ˌmoney noun [uncountable]  MONEY British English a small amount of extra money which someone earns to spend on things which they want but do not really need 零用钱 She helped her uncle out sometimes just to earn a bit of pin money. 她有时候帮叔叔的忙，赚一些零用钱。

Examples from the Corpus

pin money• It helped when I used to do a bit of coal-bag carrying in my spare time to earn some pin money.

ˈpin ˌmoney nounChineseSyllable  

of money Corpus which small amount extra a

pin money
ˈpin ˌmoney noun [uncountable]
British English a small amount of extra money which someone earns to spend on things which they want but do not really need:
    She helped her uncle out sometimes just to earn a bit of pin money.

pin moneyBrE /ˈpɪn mʌni/ 🔊NAmE /ˈpɪn mʌni/ 🔊 noun [uncountable] a small amount of money that you earn, especially when this is used to buy things that you want rather than things that you need 小额闲钱