a debt of blood; a crime of killing people that must be paid back; deep hatred resulting from a murder or massacre

must; should; ought to; expresses a need or obligation

Used to introduce the tool, method, or means by which an action is performed, meaning "using" or "with".

The red fluid that circulates in the heart and blood vessels; used in formal contexts, compounds, or when used alone in spoken language.

Used between two verb phrases to show that the first action is the means or method used to achieve the second goal

(bound form) to repay a debt; to compensate for a loss; to make up for something