縮皮 is contraction of 縮減(reduce)皮費(expense) which is a simple [v+n ] structure,
Similar but more popular term is 慳皮 (to be thrifty on expense) which is a legit dictionary entry [www.cantonese.sheik.co.uk]
Similar but more popular term is 慳皮 (to be thrifty on expense) which is a legit dictionary entry [www.cantonese.sheik.co.uk]