tie up verb 4/ˈtaɪˌʌp/ noun 3forms 4 verb4 •To secure with rope, string, etc.Don't forget to tie up your hair before you bake.The robbers tied up the bank employees before forcing a way into the vault. •To occupy, detain, keep busy, or delay.He has been tying up the phone lines for hours now. •To immobilize a capital: make a capital investment that makes that capital unavailable.Don't tie up your capital in aging accounts. •To complete, finish, or resolve.I'd like to tie up the project before I leave. tie-up /ˈtaɪˌʌp/ noun3 •A temporary interruption or cessation of a normal activity.The tie-up hit at the height of the wheat harvest and trade spokesmen said any delays in moving the grain to storage could be disastrous. — 1964 •The act of tying up (or immobilizing) a capital.Goods values increase as businesses limit their stocks in order to reduce capital tie-up. •The connection of a loom's treadles to its shafts, used in combination with the threading and treadling to create a pattern.Fancy tie-ups and treadlings can be designed that weave the ordinary symmetrical point twill like an 8-pointed star or some other motif. — 1991 formstied up · tying up · ties up · tie-ups