A final drink before one leaves.

(informal) in one attempt

plural of that one

plural of one-liner

plural of knock-on

plural of live one

(informal, idiomatic) Someone who is easily fooled, victimized, or ridiculed. / (informal, idiomatic) Someone who is eccentric, nonconformist, or otherwise peculiar.

(management) Describing a service operation at which all of a customer's needs may be satisfied by a single server, without waiting in a second queue.

(idiomatic) According to one's understanding.

In the time when one was of a certain age.