say it: kahsts
costs is a noun meaning "pecuniary reimbursement to the winning party for the expenses of litigation". It carries one recorded sense.
pecuniary reimbursement to the winning party for the expenses of litigation
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for costs come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.