In generative 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:
- 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)
* The pudding whichi the man who ordered iti said ti would be tasty was a horror show.
- Postal, P. 1971. Cross-over phenomena. New York: Holt, Rinehart and Winston.
- Ross, J.R. 1967. Constraints on variables in syntax. Doctoral dissertation, MIT (published as 'Infinite syntax!' Ablex, Norwood (1986)).