This is the 9858th most frequent Swedish word.
gömde
"Hid" (past tense of "hide").
Here, 'gömde' is used as the past tense of the verb 'gömma', which means 'to hide'. It describes a completed action of concealing the key.
Han gömde nyckeln under mattan.
He hid the key under the mat.
In this sentence, 'gömde sig' is the reflexive form of the verb 'gömma', indicating that the children performed the action of hiding on themselves.
Barnen gömde sig bakom trädet.
The children hid behind the tree.
Here, 'gömde' is again in past tense of 'gömma', used to describe the action of hiding the book, with a connotation of safeguarding or concealing it deliberately.