with stealthy steps; on tiptoe; stealthily
Describes moving quietly so as not to be heard; often used in narrative or descriptive contexts.
He entered the room with stealthy steps.
Approach on tiptoe.
Standard kanji spelling for this set phrase.
Kana spelling of the verb part; less common but still used.
A set phrase combining 足音 (footsteps) with 忍ばせて, the te-form of 忍ばせる (to conceal, to keep quiet). Literally 'concealing one's footsteps'.