say it: HAM-ur-lahk
hammerlock is a noun meaning "a wrestling hold in which the opponent's arm is twisted up behind his back". It carries one recorded sense.
a wrestling hold in which the opponent's arm is twisted up behind his back
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 hammerlock 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.