When he did, the metal sphincter let out a deafening noise and a cloud of smoke.
From the forbes.com
This is when something is so unembarrassing that one can relax one's sphincter.
From the guardian.co.uk
A normally functioning sphincter closes tightly after this passage takes place.
From the blog.beliefnet.com
For windows and doors, he envisions sphincter muscles that can open and close.
From the huffingtonpost.com
The vitamin may help muscle tone in your sphincter, the muscle that stops dribbles.
From the kansas.com
I squeezed my sphincter shut, closed my eyes, and well, I don't remember much after that.
From the online.wsj.com
Heart in the throat, sphincter puckered, a trace of panic in the voice.
From the theatlantic.com
When assayed again after three weeks, the sphincter pressure had doubled.
From the sciencedaily.com
She later told investigators it involves the strategic tensing of the sphincter muscles.
From the washingtonpost.com
More examples
A ring of muscle that contracts to close an opening
A sphincter is a structure, usually a circular muscle, that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. ...
A ringlike band of muscle that surrounds a bodily opening, constricting and relaxing as required for normal physiological functioning
The internal and external muscle that surrounds the anus. The sphincter permits continence or control over intestinal function.
A muscle that controls the opening of a duct or orifice (e.g., anal sphincter).
A round muscle that opens and closes to let fluid or other matter pass into or out of an organ. Sphincter muscles keep the bladder closed until it is time to urinate.
A valve to the bladder or anus that opens or closes.
Definition: A muscular constriction at the entrance or exit to a cavity or body organ.
A circular band of muscle that can relax and contract to open and close like a tap.