That his reform is skin deep, and that, like all other serpents, he sloughs his skin once a year.
"With residences as with—er—ladies, beauty is only skin deep," said he.
The pride was only skin deep; the pluck was part of the heroic element in Annie.
But a smile that is only skin deep is not a true smile, but only a superficial grin.
The resemblance is only skin deep, however, ...