Off the radar

From Fresh Dictionary

English

Adjectival phrase

off the radar

1. ((idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) unlikely to happen, or be important in the near future or tending to escape detection or attention.

   A UK referendum on the EU constitution now seems to be moving off the radar.