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SYNTAX: establishing a relation between two elements across another element which somehow interferes with that relation. The name 'crossover' derives from Ross's Crossover Condition:

(i)  No NP mentioned in the structural index of a 
     transformation may be reordered by that rule in 
     such a way as to cross over a co-referential 
     NP. (Ross 1967:73)
EXAMPLE: this condition accounts for the ill-formedness of (ii): the NP which has been moved across the co-referential NP it.
(ii) * The pudding whichi the man who ordered iti said ti 
       would be tasty was a horror show.
Two subcases distinguished are strong crossover and weak crossover.
LIT. Postal, P. (1971)
Ross, J.R. (1967)