the.com/pitfall
A hole disguised as flat ground, literal or otherwise, waiting for the overconfident.
means A hidden danger or unexpected difficulty that catches you off guard, especially one easy to overlook.
from From Old English: a pit dug as a trap for prey, covered to fool the unwary. The hunting hole became any concealed catastrophe — career, code, or marriage.
Literal firstOriginally an actual camouflaged trapping pit
Falling clueThe 'fall' means dropping in, not stumbling
Gaming stapleAtari's Pitfall! made the word a 1982 icon