titter

/ˈtɪtər/
noun
  1. A short, quiet, or nervous laugh.
    • Her comment was met with a titter rather than a full laugh.
    • He heard a titter from the back row and turned around to see what was funny.
    • A titter ran through the classroom when the hamster escaped its cage.
verb
  1. To laugh in a quiet, nervous, or restrained way, often at something slightly embarrassing or silly.
    • She tried not to titter during the serious speech, but the joke was too funny.
    • A few people in the audience tittered nervously when the actor forgot his lines.
    • The children began to titter when the teacher's chair squeaked loudly.
Antonyms
What does "titter" mean? | whatsthatwordmean | whatsthatwordmean