MD80 CREW HAS CLOSE ENCOUNTER WITH RJ AFTER FAILING TO HOLD AS INSTRUCTED BY GROUND CONTROL.

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I CONTACTED DFW GND CTL AND SAID THAT WE WERE CLR OF RWY 36R AT G8 AND EXPECTING SPOT X; BUT HAD NOT HAD A CHANCE TO CONTACT THE RAMP YET. DFW GND REPLIED; 'OK; JUST HOLD SHORT OF G THERE AND LET ME KNOW.' I READ BACK; 'HOLD SHORT OF G AND WE'LL LET YOU KNOW.' I THEN INFORMED THE CAPT; 'I'M OFF ATC.' THE CAPT BEGAN HIS TAXI EBOUND ON G8; THROUGH THE TXWY F INTXN AND TOWARD INTXN G. I FLIPPED THE FQ SELECTOR FOR #2 RADIO TO THE RAMP FQ ON THE OTHER HEAD. I TURNED THE VOLUME CTL FOR #1 RADIO TO OFF; SELECTED THE XMIT BUTTON FOR #2 RADIO AND TURNED UP THE VOLUME CTL FOR #2 RADIO. I CONTACTED THE RAMP CTL; TOLD HIM THAT WE WERE ON DECK THE W SIDE AND AT G8 FOR THE GATE. (WHEN LOOKING AT THE GATE AREA FROM TXWY G8; FACING E; AND SHORT OF TXWY F; GATE IS SLIGHTLY TO THE R.) SPOT X IS THE NEAREST RAMP SPOT TO THE R AND AN MD80 WAS PARKED AT SPOT X. SPOT Y IS THE NEXT SPOT TO THE R.) RAMP REPLIED; 'SPOT Y AND CLRED TO THE GATE.' I ACKNOWLEDGED RAMP'S INSTRUCTIONS AND IMMEDIATELY SWITCHED MY RADIO XMIT AND VOLUME CTLS BACK TO RADIO #1 TO INFORM GND CTL OF OUR ENTRY SPOT AND OBTAIN CLRNC TO TAXI. THE CAPT WAS LOOKING AT THE OPEN GATE IN A RELATIVE POS JUST TO THE R OF OUR TXWY INTXN. THE CAPT THEN STATED; 'CLRED TO THE GATE;' AND STARTED HIS TAXI TOWARD THE GOLF INTXN; PRIOR TO MY TALKING TO GND AND GETTING OUR CLRNC TO TAXI. AS I LOOKED UP FROM MY RADIO CTL PANEL; I SAW A REGIONAL JET TAXIING S ON TXWY G; APCHING THE G8 INTXN. I IMMEDIATELY YELLED; 'STOP; STOP; STOP!' TO THE CAPT AS I POINTED TO THE NEARING REGIONAL JET ON TXWY G AND INFORMED HIM THAT WE WERE TOLD TO HOLD SHORT OF TXWY G! HE STOPPED THE ACFT SHORT OF TXWY G AS THE REGIONAL JET BEGAN A FADE TO HIS L TO AVOID A POTENTIAL TXWY ENCROACHMENT. I THEN CONTACTED GND AND SAID THAT RAMP HAD CLRED US IN TO SPOT Y. DFW GND THEN CLRED US TO TAXI AROUND THE COMPANY ON SPOT X AND IN Y. DFW GND MENTIONED NOTHING ABOUT THE REGIONAL JET AND DID NOT ASK IF WE HAD ENCROACHED ON HIM. I ASKED THE CAPT IF HE WOULD HAVE SEEN THE REGIONAL JET AND STOPPED IF I HAD NOT POINTED IT OUT AND YELLED TO STOP; AND THE CAPT SAID THAT HE PROBABLY WOULD HAVE NOT HAVE SEEN THE RJ OR STOPPED. THE CAPT SAID THAT HE WAS LOCKED ON THE OPEN GATE; WAS LISTENING TO ME ON RAMP FQ; AND HEARD; 'CLRED TO THE GATE.' HE SAID THAT HE 'WOULD NEVER DO THAT AGAIN.' HE WAS SUPPOSED TO BE MONITORING GND CTL AND HOLDING SHORT OF TXWY G WHILE I WAS OFF THE GND CTL FQ GETTING OUR RAMP ENTRY INFO. AN ITEM OF NOTE; I HAD MY ARPT DIAGRAM OUT AND IN USE DURING THIS ENTIRE TAXI EVOLUTION. THIS WAS A DAY; VFR; CLR-AND-A-MILLION SCENARIO; AND WE ALMOST HAD A GND COLLISION. WHAT IF IT WERE NIGHT? WHAT IF THERE WERE WET; ICY OR SLIPPERY TXWYS? WHAT IF I KEPT MY HEAD DOWN ANOTHER SECOND TO CONSULT THE TAXI DIAGRAM FURTHER? WE ALL HAVE JOBS TO DO IN THE AIRPLANE. WE ARE A TEAM AND WE HAVE TO WORK EFFICIENTLY AND EFFECTIVELY TOGETHER. THERE HAS TO BE A DELEGATION OF TASKS AND RESPONSIBILITIES AND WE HAVE TO DO OUR JOBS DILIGENTLY AND CORRECTLY. THERE IS ALWAYS A RISK; ALWAYS A THREAT; EVEN IN THE MOST BENIGN OF ENVIRONMENTS. NEVER LET YOUR GUARD DOWN AND NEVER ASSUME THAT THE OTHER GUY HAS IT FIGURED OUT. STOP AND ASK.