Check from a piece that comes to existence by moving away another piece, therewith opening a line or diagonal from where the check originates.
A well-known example is:
1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4? (a blunder; best is 3...d6) 4.Qe2 Nf6 5.Nc6+.
The check is given by the Queen but was caused by moving away the Knight from the e-file. Black loses his Queen.