shoestring      
noun [ C usually plural ] uk/ˈʃuː.strɪŋ/ us/ˈʃuː.strɪŋ/
 US鞋带 
a  shoelace 
 Idiom   
on a shoestringidiom  informal 以极少量资金
If you do something on a shoestring, you do it with a very small amount of money.
  The film was made on a shoestring. 这部电影是个小制作。