under erasure

prep_phrase

(idiomatic) Of a piece of text, written and struck through; hence, figuratively in some sense both present and absent.

The author wrote the phrase 'under erasure' to indicate that the meaning of the text is unstable.

意味（1）

(idiomatic) Of a piece of text, written and struck through; hence, figuratively in some sense both present and absent.

fol. 66 b l. 13 the letters under erasure were something like cacis.