if you do something, especially kill someone, in cold blood, you do it in a way which is cruel because you plan it and do it without emotion.

Four men were charged with the killing, in cold blood, of a French tourist last summer.

An unarmed boy was shot in cold blood outside his home yesterday.

• have half a mind to
• have half a mind to do something
• have half an ear on
• have half an ear on something
• have half an eye on
• have half an eye on someone
• have half an eye on something
• have hand in the till
• have hands full
• have hanging over head
• have hanging over your head
• have head in the clouds
• have head screwed on
• have head screwed on right
• have head screwed on the right way
• have head stuck up arse
• have head stuck up your arse
• have head up arse
• have head up your arse
• have heard the last of
• have heard the last of someone
• have heard the last of something
• have heart set on
• have heart set on doing something
• have heart set on something