(rugby) The five forwards who form the front row and the second row in the scrum. / (comedy) A five-minute set of jokes performed by a stand-up comedian, usually made up of only their best material.

(biology) An intercellular junction between epithelial cells whose membranes join together to form a virtually impermeable barrier to fluid.

(idiomatic) A difficult position. / Used other than figuratively or idiomatically: see tight, spot.

To hold onto something securely or closely. / To remain patient, until a specified event occurs.

(military) An order that weapons may only be fired at targets (especially aircraft or missiles) that are positively identified as hostile.

plural of tight junction

As tightly screwed as can be achieved by the strength of one's fingers, without the use of any other tools.

(informal, chiefly imperative) To wait, without attempting to address a challenging, alarming, or dangerous situation, until a later point in time. / To grasp tightly.

(economics) A monetary policy that makes money, credit, or both difficult for many borrowers to obtain and only at relatively high interest rates.

plural of tight ship