Meaning of “pad” - Learner’s Dictionary

pad

verb uk us /pæd/ (present participle padding, past tense and past participle padded)
pad about/around/down, etc

to walk somewhere with small, quiet steps:

He padded downstairs and out of the front door.

[ T ] to protect something or make something more comfortable by filling or surrounding it with soft material

(Definition of “pad verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)