fall foul

present singular third person falls foul · participle present falling foul · past fell foul · participle past fallen foul

1. archaicidiomaticTo collide; to conflict with; to attack (+ on, of, upon)

   If they be any ways offended, […]they fall foul.

   1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: […] John Lichfield and James Short, for Henry Cripps, →OCLC

   1 more example

   He was, literally speaking, drunk; which circumstance, together with his natural impetuosity, could produce no other effect than his running immediately up to his daughter, upon whom he fell foul with his tongue in the most inveterate manner [...]

   1749, Henry Fielding, The History of Tom Jones, a Foundling, volume (please specify |volume=I to VI), London: A[ndrew] Millar, […], →OCLC, book V

2. idiomaticTo be defeated or thwarted (by); to suffer (+ of)

   If Chelsea were to fall foul of profit and sustainability, they would be expected to cite unforeseen circumstances, much as some clubs have claimed Covid writedowns: their books would have been sound but for the pandemic.

   March 11 2022, David Hytner, “Chelsea are in crisis but there is no will to leave club on their knees”, in The Guardian

   2 more examples

   Sky News fell foul of its own woolly reporting on Tuesday, when it reported "human remains" had been found on Saddleworth Moor. Ever keen to spin a good yarn, they immediately linked the story to moors murderers Ian Brady and Myra Hindley - only for the police to emerge seven hours later and announce that, after very careful inspection, they could confirm the carcass was not human …

   2008, The Guardian, Media Monkey, 4 Aug 2008

   Passengers may find themselves in a catch-22 situation, unable to buy a ticket for any number of reasons, ranging from an out-of-order ticket vending machine to a lengthy queue to use one, and yet then fall foul of the penalty fare regime.

   2023 July 26, Christian Wolmar, “Closing ticket offices to lead to 'catch-22' for passengers”, in RAIL, number 988, page 42