The antique dealer displayed several black jacks on the shelf, each with intricate brass inlays.

The coach had the players do sets of jumping-jacks to improve their endurance.

Museum conservators carefully cataloged the Victorian games, noting several worn quarter jacks among the pieces.

At the baseball game, we bought two boxes of Cracker Jacks and shared them in the stands.

Before the conference, he checked the cable jacks in the conference room to ensure every projector would receive a signal.

The farm's calving jacks were inspected before spring birthing began.

Local residents organized a neighborhood watch after a rise in car-jackings near the train station.

The dockworkers used cargo jacks to lift the heavy pallets onto the ship.

The yellow jacks darted between the coral heads as we dove.

The engineer inspected the jacking gears before rotating the turbine shaft.