Daren't

She daren't say no.

I daren't overtake.

I daren't go and have a look.

I daren't go and look.

I daren't look.

"I daren't go and speak to Mary. What if it turns out she can't stand me?" "Then at least you'll know."

When I was a kid, I daren't go on the roller coaster. I still don't like it.

Hippos are so big that even lions daren't attack them.

c1865, 1998, Leo N. Tolstoy, War and Peace, page 161 - "The bigwigs here think so too, but they daren't say so."