Etymology
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pitfall (n.)

mid-14c., "concealed hole into which a person or animal may fall unawares," from pit (n.1) + fall (n.). Figurative sense of "any hidden danger or concealed source of disaster" is recorded from early 15c.

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Definitions of pitfall

pitfall (n.)
an unforeseen or unexpected or surprising difficulty;
Synonyms: booby trap
pitfall (n.)
a trap in the form of a concealed hole;
Synonyms: pit
From wordnet.princeton.edu