Definitions

1. verb

to utter or make a hissing sound, typically with the lips

“The kid wissled at the teacher, making a loud hissing sound with his lips.”

2. noun

a hissing sound, typically made with the lips

“The wissle of air through the broken window was unsettling.”

3. verb

to emit or make a hissing sound

“The steam wissled as it escaped from the pipe.”