pour cold water on

a cold day in July

The time of occurrence of an event that will never happen.

blood in the water

In a competitive situation, the exhibition of apparent weakness or vulnerability by one party, especially when this leads to a feeling of vulnerability or greater pressure to perform on the part of the weak party, or enhanced expectation of victory by the others.

blood is thicker than water

Family relations and loyalties are stronger than relationships with people who are not family members.

blow hot and cold

To behave inconsistently; to vacillate or to waver, as between extremes of opinion or emotion.

blow out of the water

To trounce; to defeat thoroughly, as at a game or in battle.

carbonated water

Water that contains carbon dioxide dissolved in it under pressure and is intended for drinking.

carry someone's water

To do someone's bidding; to serve someone's interests.

carry water for

To perform menial tasks for; to serve; to assist; to be forced by politics or pragmatism to endorse or promote a belief, individual, or organization that in reality one does not fully support.