Under wraps

From Fresh Dictionary

English

Prepositional phrase

under wraps

1. ((idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) secret or hidden

   They're trying to keep the new product under wraps and hidden from their competitors.

See also

• keep a lid on