(organic chemistry) diethyl ether.

A relatively flat, oval onion, originally from northern Italy.

(colloquial, figuratively) One's sanity; one's mental faculties.

(fencing) The starting position of a fencing bout; en garde. / Vigilant, alert. / (aviation) Transmitting on the aircraft emergency frequency.

(US, idiomatic) To leave, especially to leave a difficult or dangerous environment with all possible haste.

Synonym of up to here

To hold forth about something in an opinionated manner. / (military) Command instructing a person to speak up or acknowledge something.

An offshoot. / An incidental benefit or unexpected pay-off. / By-product.

That is either fully on or fully off, and is used to toggle a status between on and off; as in an on-off switch / That fluctuates between a positive and negative status, as an on-off relationship

(transitive) To make an order for something to be delivered, especially takeaway food.