say it: SWEET-hahrt
sweetheart is a noun and adjective meaning "a person loved by another person". It carries 4 recorded senses.
privileged treatment of a favored person or corporation (sometimes unethically)
“another sweetheart deal based on political influence”
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 sweetheart 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.