how to do DHCP release

I have 7.2 and have a need to do dhcp release on the WAN side.
I looked up the doc and the dhclient command didn't have -r option for release.

Is there anyway I could do it from the command line? Any help is appreciated.
 
This information seems to no longer be accurate for 9.1; I can't see anything on the man page for release. What keyword am I missing?
 
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