Etymology
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pis aller (n.)

"last resource, what one would do at the worst," 1670s, French, literally "to go worse," from pis "worse," from Latin peius, neuter of peior "worse" (see pejorative) + aller "to go" (see alley (n.1)).

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Definitions of pis aller

pis aller (n.)
an expedient adopted only in desperation;
`pis aller' is French for `worst going'
Synonyms: last resort
From wordnet.princeton.edu