素知

sùzhī
  1. (archaic) to be well acquainted with; to know quite well
  2. to be well acquainted with; to know quite well

Wiktionary

Entry Composition

1 素 sù
  1. raw silk
  2. white
  3. plain, unadorned
  4. vegetarian (food)
  5. essence
  6. nature
  7. element
  8. constituent
  9. usually
  10. always
  11. ever
=2 知 zhī
  1. to know
  2. to be aware
=2 知 zhì
  1. (obsolete on its own in Standard Chinese) Original form of 智 (zhì, “knowing, wisdom, intelligence”).
  2. Original form of 智 (zhì, “knowing, wisdom, intelligence”).