Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
lash-up is a noun meaning "any improvised arrangement for temporary use". It carries one recorded sense.
any improvised arrangement for temporary use
Definitions, synonyms and semantic relations for lash-up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.