Focus on the pronunciation of set sth (off) against sth
English definition of “set sth (off) against sth”
set sth (off) against sth — Phrasal Verb with set
/set/ verb (setting, set, set)
› ACCOUNTING to use or record one thing, especially the cost of something, in order to reduce or remove the effect of another: Costs of new equipment or machinery, such as a computer, can also be set against tax. The rules do not allow surpluses over book value in other parts of the business to be set off against reductions elsewhere.