Plain English Meaning
A turn where the wings are tilted only a little, so the airplane changes direction slowly and smoothly.
Full Definition
A turn flown with a small angle of bank, generally less than about 20 degrees, producing a slow rate of turn and a gentle change in heading.
Context Anchor
Seen in ground-reference maneuvers such as the rectangular course, where the pilot changes the amount of bank to account for wind and groundspeed.
Derivation
Shallow' comes from Old English meaning 'not deep.' Applied to a turn, it describes a bank angle that is small rather than steep — the wings are only slightly tilted from level.
Why Pilots Care
Using the correct shallow bank lets the pilot correct for on each leg without losing sight of the or adding unnecessary .