sis= [sis]
preverbal. pretend; play at
../mp3s/s/sis-dl-hb-01.mp3 Nah dip huk sisdzoxs'nm heytsi sisuusm. We played house when we were small.

Related entries: Stem with modifying proclitic sis'aaxs  laugh | Stem with modifying proclitic sisdzoxs  picnic/play house/common-law | Phrasal Verb sisgwn ḵ'aatsk  please

Source: Draft Dictionary entry.