tie up

verb

1. secure with or as if with ropes"tie down the prisoners"
2. invest so as to make unavailable for other purposes"All my money is tied up in long-term investments"
3. restrain from moving or operating normally"Traffic is tied up for miles around the bridge where the accident occurred"
4. secure in or as if in a berth or dock"tie up the boat"
5. finish the last row