1. Just a warning shot across the bow.

2. We fire a warning shot across their bow

3. Intel thinks this is just a warning shot across the bow.

4. Just a warning shot to let them know we mean business.

5. The guard carries a gun in case a warning shot is needed, and with good reason.

6. Sir, the salvage vessel reports the North Korean cruiser, Choson, has fired a warning shot across her bow.

7. The campaign called the July Boycott "a warning shot across Facebook's bow," implying more action was to …

8. See: a hair Across (one's) ass a shot Across somebody's bows a shot Across the bows a warning shot Across the bows Across the board Across the pond Across the way all over hell's half acre all over the board all over the map be Across (something) be Across something broad Across the beam come Across come Across as (someone or something) come Across as