A proof, witness of something.
saksí
saksí
Ipirma ko tan myan sistīgo mo a tongpalen ko kari ko.
I sign (my name) so there is your proof that I fulfill my promise.
Someone (mag-) testifies as a witness at/to something (-an).
Magsistīgo si marāan do nakapanakaw ni Konos.
Uncle testifies to Konos' robbery.
Sistīgwan ko iyaw kāso ni ādi.
I testify at the court case of younger sibling.