Make Faces Meaning

(idiomatic, intransitive) Alternative form of make a face

Example: 1912: Edgar Rice Burroughs, Tarzan of the Apes, Chapter 5
  Tarzan on his part never lost an opportunity to show that he fully reciprocated his foster father's sentiments, and whenever he could safely annoy him or make faces at him or hurl insults upon him from the safety of his mother's arms, or the slender branches of the higher trees, he did so.