Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
tie-up is a noun meaning "a social or business relationship". It carries 2 recorded senses.
a social or business relationship
“a valuable financial affiliation”
“he was sorry he had to sever his ties with other members of the team”
“many close associations with England”
an interruption of normal activity
Definitions, synonyms and semantic relations for tie-up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.