1. (用线或绳)固定，扎牢，捆紧
When you tie something up, you fasten string or rope round it so that it is firm or secure.
2. 把…绑起来;捆绑
If someone ties another person up, they fasten ropes or chains around them so that they cannot move or escape.
3. 将(动物)拴牢;把…系牢
If you tie an animal up, you fasten it to a fixed object with a piece of rope so that it cannot run away.
4. 完满解答，妥善解决(问题等)
If you tie up an issue or problem, you deal with it in a way that gives definite conclusions or answers.
5. see also: tied up;tie-up
1. finish the last row
Synonym: bind off
2. secure with or as if with ropes
e.g. tie down the prisoners
tie up the old newspapers and bring them to the recycling shed
3. secure in or as if in a berth or dock
e.g. tie up the boat
4. restrain from moving or operating normally
e.g. Traffic is tied up for miles around the bridge where the accident occurred
5. invest so as to make unavailable for other purposes
e.g. All my money is tied up in long-term investments