Alt-Arrow in terminal

Dear Slack users,

I am sorry to go back to this; I actually asked this question at one
point but could not seem to find it.

What I want to ask about is navigating the terminal line with
Ctrl-<leftarrow> and -<rightarrow>.
I have found a suggestion to put:
"\eOd": backward-word
"\eOc": forward-word
in .inputrc. Unfortunately, that did not actually DO anything.

Can anyone suggest to me what I am missing?
I see there is an inputrc in /etc/inputrc which suggests the same, I am
just not actually GETTING anything... even when I copy it to
~/.inputrc .

Any thoughts?

All the best,
Morten