What does seal up mean?
seal up
Definition
To close a bag or a box firmly with tape or a strip, so that nobody can open it without it showing.
Example sentences
Press the strip down hard to seal up the evidence bag, then sign across it.
Press the strip down hard to seal up the evidence bag, then sign across it.
Every evidence box gets sealed up with tape and initialled before it goes on the rack.
Every evidence box gets sealed up with tape and initialled before it goes on the rack.