Treading in example sentence
Alas, although the knight's role is little more than a cameo in Alice, the writers here have mercilessly expanded the part, even though it meant treading on the lines of more capable players like break-your-heart Rita La Roy (a most engaging and super-attractively regal young duchess) and Kay Hughes' pleasing Cheshire Cat who, as we might expect, disappears from the action, alas, for long spells.