Found:
Feature checking
SYNTAX: Notion in checking theory. Feature checking is a relation between two elements such that one or more designated features they share are eliminated.
EXAMPLE: in who did you see the +wh feature of
who is checked in the specifier position of CP (spec,CP) against the +wh feature of C. If who or C do not check their +wh feature, the derivation crashes
(cf. *you saw who).