Source : WordNet®

tie up
     v 1: secure with or as if with ropes; "tie down the prisoners";
          "tie up the old newspapes and bring them to the
          recycling shed" [syn: {tie down}, {bind}, {truss}]
     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"
        [syn: {moor}, {berth}]
     5: finish the last row [syn: {bind off}]