Moving carefully, quietly, warily or stealthily(adverb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "on tiptoe" in a sentence
"As a friendly waitress led them to a table, William made an effort to look relaxed and self-confident, but with Trixie walking on tiptoe and Buddy staring at everything goggle-eyed, his cool, worldly-wise role was a little hard to hang on to."
"Then he went up to Feuerstein, stood on tiptoe and, waving his arms frantically above his head, yelled into his face "Rindsvieh!""
"By 0945 hours, all the infanteers less the rearguard, who continued to occupy perimeter trenches, had arrived — almost on tiptoe — at the Ml 13s."