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say it: STAHP-wahch
stopwatch is a noun meaning "a timepiece that can be started or stopped for exact timing (as of a race)". It carries one recorded sense.
a timepiece that can be started or stopped for exact timing (as of a race)
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 stopwatch 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.