lit. from the French meaning 'double meaning.' a phrase or saying that has another connotation apart from the literal, almost always sexual in nature. A staple of the British 'carry on' series of films of thr 1960s and 70s, and the most excellent 'Bottom' TV show of the early 90s on the BBC
Rectus sheath. The rectus sheath is made up of two parts, known as the posterior sheath and the anterior sheath. These sheaths are made of fibers of the transversus abdominis, internal abdominal oblique (IAO), and external abdominal oblique (EAO), which are muscles of the abdomen.
Three are flat, the external oblique, the internal oblique and the transversus abdominis, and one is a straplike muscle, the rectus abdominis. The fibers in each of these muscles run in a cross direction from one another in a way that maximizes the strength of the three muscles together (think of plywood).