The word "tressing" is spelled with a double "s" in the middle, which indicates the sound of /s/ is prolonged. The IPA phonetic transcription for "tressing" is /ˈtresɪŋ/. The first syllable is stressed, and pronounced as /ˈtres/. The second syllable, spelled with "-ing," is pronounced with the sound /ɪŋ/, which is the present participle ending of a verb. "Tressing" refers to the act of making braids or twists in hair or yarn, with three or more strands.
The word "tressing" is derived from the noun "tress", which originated from the Old French term "tresse". "Tresse" itself comes from the Latin word "trica", meaning "fold of hair" or "lock of hair". Over time, "tress" developed into a verb form, "tressing", which refers to the act of braiding or making a tress.