up
1.
to tie sb's arms and legs tightly so that they cannot move or escape :
The gang tied up a security guard.
2.
[ usually passive ] to keep sb busy so that they have no time for other things :
I'm tied up in a meeting until 3.
up
1.
to tie sb's arms and legs tightly so that they cannot move or escape :
The gang tied up a security guard.
2.
[ usually passive ] to keep sb busy so that they have no time for other things :
I'm tied up in a meeting until 3.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005