1. [adv]  extremely wet; "dripping wet"; "soaking wet"
2. [adj]  wet through and through; thoroughly wet; "stood at the door drenched (or soaked) by the rain"; "a shirt saturated with perspiration"; "his shoes were sopping (or soaking)"; "the speaker's sodden collar"; "soppy clothes"

SOPPING is a 7 letter word that starts with S.