verb

spend less; reduce one’s expenses.

I have to economize where I can

save (money),cut expenditure,cut costs,cut back,make cutbacks,make cuts,retrench,husband one’s resources,budget,be (more) economical,make economies,be thrifty,be sparing,be frugal,buy (more) cheaply,use less,reduce/decrease wastage,scrimp,scrimp and save,scrimp and scrape,cut corners,tighten one’s belt,draw in one’s horns,count the/your pennies,watch the/your pennies,pinch the/your pennies,rake and scrape