kdb meta-rm <key name> <metaname>

Where key name is the name of the key and metaname is the name of the metakey you want to remove.

This command removes a metakey of a key from the Key database.

-H, --help: Show the man page.
-V, --version: Print version info.
-p, --profile <profile>: Use a different kdb profile.
-C, --color <when>: Print never/auto(default)/always colored output.
-v, --verbose: Explain what is happening. Prints additional information in case of errors/warnings.
-d, --debug: Give debug information. Prints additional debug information in case of errors/warnings.

To remove metakey metakey of a key:
kdb meta-rm user:/example metakey