Definition 1 of 2
Plain English Meaning
A type of turbulence that feels like a fast, steady bumpy ride, but the airplane keeps flying straight and level — the nose doesn't pitch around and the altitude doesn't move much.
Full Definition
A pilot report classification for turbulence that causes rapid and somewhat rhythmic bumpiness without producing appreciable changes in aircraft altitude or attitude. Reported in two intensities: light chop (slight, rapid, somewhat rhythmic bumpiness without noticeable changes in altitude or attitude) and moderate chop (similar to light chop but of greater intensity, causing rapid bumps or jolts without noticeable changes in altitude or attitude).
Context Anchor
Seen or heard in weather reports and pilot reports, often with words like light, moderate, or severe to how strong the bumps are.