(mechanics) A valve (as in an internal combustion engine) which consists of a sliding shaft with a disk on the end (the disk being shaped to alternately plug and unplug a matching port) and which is operated by springs and possibly cams interacting with the shaft.

(US) A light hollow muffin, resembling an individual Yorkshire pudding. / (Internet) A pop-up element that is rendered over the current web page rather than opening a new tab or window.

so as to be generally favored or accepted by the people / commonly / currently

having bulging eyes / (by extension) astonished

The act of making something popular to the general public.

(philosophy) A political doctrine or philosophy that proposes that the rights and powers of ordinary people are exploited by a privileged elite, and supports their struggle to overcome this.

(US, colloquial, sometimes childish) father, papa.

Average population per unit area; especially, the average number of people who live on each square kilometer (or square mile) of land.

Used other than figuratively or idiomatically: see tall, poppy. / (Australia, New Zealand) A conspicuously successful person, especially one who attracts envious hostility.

(Australia, New Zealand) The tendency to disparage conspicuously successful people.