conspicuous by your absence

conspicuous by (one's)/it's absence

Especially noticeable because of being missing or absent (from something). You're the loudest one in the class, so of course you're conspicuous by your absence! The governor's economic stimulus plan was conspicuous by its absence during his speech this afternoon.
See also: absence, by, conspicuous
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

conspicuous by your absence

obviously not present in a place where you should be.
This phrase was coined by Lord John Russell in a speech made in 1859 . He acknowledged as his source for the idea a passage in Tacitus describing a procession of images at a funeral: the fact that those of Cassius and Brutus were absent attracted a great deal of attention.
See also: absence, by, conspicuous
Farlex Partner Idioms Dictionary © Farlex 2017

conˌspicuous by your ˈabsence

not present in a situation or place, when it is obvious that you should be there: When it came to cleaning up afterwards, Anne was conspicuous by her absence.
See also: absence, by, conspicuous
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
When you've been conspicuous by your absence, there's nothing better than making a conspicuous return.
In present reality, however, there are two good reasons to set up shop on the Web: to have a good foundation in place as the Net expands, and to avoid being conspicuous by your absence. In time, the Internet will become a valuable tool for providing existing and potential employees and customers with information about your company, its products, its employment policies and its executives.