onus
n
(=responsibility)
the onus is on sb to do sth à charge pour qn de faire qch
The onus is upon him to prove it. À charge pour lui de le prouver.
→ the onus is on the policyholder to be truthful.
the onus of proof la charge de la preuve
The onus of proof must lie with them. La charge de la preuve doit leur incomber.