confirm the truth of

the act of inspecting or verifying

additional proof that something that was believed (some fact or hypothesis or theory) is correct

read for errors

verify by using a duplicate register for comparison

check once more to be absolutely sure

check out conflicting sources; crosscheck facts, for example

make sure of

put a check mark on or near or next to

verify by consulting a source or authority

find out, learn, or determine with certainty, usually by making an inquiry or other effort

check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard