What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
1An organism or part of an organism conceptualized as a machine. Also: a machine with properties analogous to those of a living being. Now rare.
2The ordered sequence or pattern of interdependent events involved in a biological or biochemical process.
Early 20th century. From bio- + mechanism, after biomechanical and biomechanics.