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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
eff is a verb meaning "have sexual intercourse with". It carries one recorded sense.
have sexual intercourse with
“This student sleeps with everyone in her dorm”
“Adam knew Eve”
“Were you ever intimate with this man?”
archaism
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 eff come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.