tie–up

tie–up /ˈtaɪˌʌp/ noun
plural tie–ups
tie–up
/ˈtaɪˌʌp/
noun
plural tie–ups
Britannica Dictionary definition of TIE–UP
[count]
1 
chiefly US : a situation in which something (such as traffic) becomes very slow or stops because of a problem, accident, etc.
2 
chiefly British
a  : a close connection between people or things
b  : an agreement to do business together
— see also tie up at 1tie