blood, sweat and tears

blood and guts

Gore; gruesome images.

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.

break a sweat

To put effort into something.

burst into tears

To suddenly start crying or sobbing.

don't sweat it

Do not worry about it.

end in tears

To end badly.

get blood out of a stone

To do something difficult, frustrating, or pointless.