(informal, idiomatic) The United States.

(Britain) To allow a portion to remain unused or unconsumed. / Give over; stop it!

(automotive) A bright red lamp (normally one of a pair) at the rear of a motor car that can be switched on during foggy weather so as to avoid collisions from cars approaching from behind

A stepfather of one's spouse.

(US) The president of the United States.

The cuckoo-flower, Cardamine pratensis.

A lamp designed to be used on tables.

The collective group of people who are available for employment, whether currently employed or unemployed (though sometimes only those unemployed people who are seeking work are included).

Free time given to sailors of the military navy when they are off duty and allowed to disembark and spend time on land.

(chiefly US) A traffic lane on a limited-access road, intended for faster traffic, that has even more limited access.