en_tn_condensed/hos/13/12.md

Ephraim's iniquity

Possible meanings are 1) the word "iniquity" refers to the actual acts of iniquity, or 2) the guilt that God attaches to iniquity, or 3) the punishment God will give for that iniquity.

has been bound up

Yahweh speaks of his own remembering Ephraim's iniquity as if he were a scribe who had written down a record of them, rolled up the scroll, bound it, and put it away so he could show it to people in the future.

his sin has been stored up

Ephraim's guilt is spoken of as if it were a solid object that a person could store for later use.