PG status

Hi,
While I was having the issue with OSD down, I noticed the following output from ceph -s about PG status:
pgs: 22.08% pgs not active
214/645 objects degraded
254 active+undersized
97 active+clean
61 down
41 undersized+peered
23 active+undersized+degraded

4 undersized+degraded

I guess degraded meant that it does not have all replicas available (eg. 2 out of 3 available)...
What does undersized mean?
What does peered mean?
Thank you very much,
Theeraphong T.

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