It was a dangerous undertaking; for he would be trapped if the passage narrowed.

Men would go out and "run" the logs down the river, a dangerous undertaking.

Such a fusion would be a delicate and dangerous undertaking.

The old man of good counsel looked at the young prince and said: 'Turn back from this dangerous undertaking.

To be Emperor during this period was a highly dangerous undertaking.

Without specialty training, this can be a dangerous undertaking.

After a further wait, they decided to make for the hut by land, a dangerous undertaking without appropriate equipment and experience.

It was no good, to let himself be stampeded into such a dangerous undertaking on a strange world!

That she hadn't gone haring off on another dangerous undertaking.

If I am right, getting her back is going to be a very dangerous undertaking.