To corroborate is to back someone else’s story. If you swear to your teacher that you didn't throw the spitball, and your friends corroborate your story by promising that you were concentrating on math homework, she might actually believe you.
For example, a witness in court corroborates the testimony of others, and further experimentation can corroborate a scientific theory. Near synonyms are substantiate and confirm. Corroborate, originally meaning "to support or strengthen," was borrowed from Latin corrōborāre, formed from the prefix cor- "completely" plus rōborāre "to strengthen" (from rōbur "strength").
v give evidence for
v establish or strengthen as with new evidence or facts
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back, back up
establish as valid or genuine
give supporting evidence
confirm the truth of
demonstrate, establish, prove, shew, show
establish the validity of something, as by an example, explanation or experiment
support or supply with references
prove valid; show or confirm the validity of something
check, check off, mark, mark off, tick, tick off
put a check mark on or near or next to
ascertain, assure, check, control, ensure, insure, see, see to it
be careful or certain to do something; make certain of something
verify by consulting a source or authority
show one's ability or courage
prove formally; demonstrate by a mathematical, formal proof
specify the origin of
prove negative; show to be false
prove to be of unsound mind or demonstrate someone's incompetence