What does the ed in hiked do to meaningof base word?

The "ed" in "hiked" is the past tense marker. It tells us that the action of hiking (going on a walk in the countryside or mountains) happened in the past.

Here's how it works:

* Base word: Hike (present tense)

* Past tense: Hiked

So, "hiked" means "to have gone on a walk in the countryside or mountains" in the past.