This is the 471st most frequent Danish word.
jer
"Jer" means "you" (plural) in English.
"Jer" is used as a plural second-person pronoun in the objective case, referring to the people the speaker is addressing.
Jeg kan høre jer fra værelset.
I can hear you from the room.
"Jer" changes to "jeres" to indicate plural second-person possessive, meaning 'your' for the group being addressed and related to homework belonging to them.
Har I lavet jeres lektier?
Have you done your homework?
"Jer" is again used as a plural second-person pronoun in the objective case, highlighting the group to whom the speaker is offering help.