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He ties up one or two guys at a time.

I don't want to tie up the line with a lot of other calls.

Maybe he got tied up on something, some test or whatever.

I may be tied up the rest of the night?

They had both been hit on the head and tied up.

Got a feeling I'm going to be tied up out here most of the day.

I had to tie you up for your own good.

My father was tied up with a very involved financial matter.

I know he had you tied up at one point.

You can get tied up trying to figure out who is what.