Crocodiles will either dig a hole about 30 cms deep or pile up leaves to incubate their eggs.

Thus, whenever Tutt seemed to be incubating some evasion of law which seemed more subtly plausible than ordinary she made it a point to call it to Mr. Tutt's attention.

The dark, damp house incubates the germs.

"I'll have to incubate an idea between now and noon, somehow.