Rain on somebody's parade

From Fresh Dictionary

English

Phrasal verb

to rain on somebody's parade

1. ((idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) to disappoint or discourage somebody

   I hate to rain on your parade, but lots of people have tried that strategy and it hasn't worked yet.

See also

• burst somebody's bubble
• put a damper on
• wet blanket