He plunged under, unable to tell up from down in the dark depths.

Earth was off to starboard, apparently full, although one can't tell that close up.

He couldn't tell up from down or what was floor or wall.

It had been unsettling, not being able to tell up from down, so to speak.

It is sometimes difficult to tell up from down.

Under the churning water, it was difficult to tell up from down.

Just see you tell the truth and back us up in what we say.

She'll have you lying awake nights trying to tell up from down.

I had no great sense of direction, but could certainly tell up from down.

It's like an old story we tell up North, about the man who goes to visit the trolls.