What does "skip 2dcs" mean?

I am using a pattern that calls to make shells. I'm new to crochet and I don't quite understand "skip 2dcs" ...

Shell Stitches Used
Side shell = “skip 2dcs, (2dcs, ch 1, 2dcs) in next st, skip 2dcs”
Center shell = “ch 1, skip 2 dcs, (2dcs, ch 1, 2dcs ) in next st, skip 2 dcs, ch 1”
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