"Slack-jawed" Natural Recordings by Native Speakers
Slack-jawed: (adjective) having jaws that are loosely hanging open, often in a state of shock, awe, or amazement, also used to describe someone or something that seems weak or lacking in energy or enthusiasm.
A slab is a thick, flat piece of material, often stone or concrete, used for building or construction. It can also refer to a plate or slab of food, such as a beef slab or a slab of pizza.
To become or make something less tight or severe; to reduce the force or pressure of something. <br><br>Example: "The tightness in my muscles began to slacken after a long hot shower."