To make something hard and stony by impregnating with calcium salts.
To become hard and stony by impregnation with calcium salts.
To make thicker (in the sense of more viscous).
To become thicker (in the sense of wider).
To become thicker (in the sense of more viscous).
To make thicker (in the sense of wider).
To make more frequent.
To strengthen; to confirm.