MD88 CAPT STOPPED TAXI OUT TO AVOID AN ACR CL65 TAXIING TOWARD THEM FROM THE OPPOSITE DIRECTION ON THE SAME TXWY. THE CL65 FLC MANEUVERED AROUND THE MD88 AND CONTINUED ON. RAMP CTLR HAD NOT ISSUED A TA OF THE CONFLICTING CL65.

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TAXIING OUT OF CVG RAMP; WE WERE SWITCHED FROM RAMP TWR X TO RAMP TWR Y FOR TAXI CLRNC WBOUND TO SPOT X. Y RAMP CLRED US TO SPOT X VIA THE N LINE. MY ATTN WAS DIRECTED PRIMARILY FORWARD AND TO THE R TO SEE THE ACTIVITY ON THE N RAMP AS WELL AS ACFT THAT MAY BE APCHING FROM TERMINALS. PASSING THE INTXN OF TXWY F; WE SAW AN RJ HEADED AT US NBOUND ON TXWY F AND NOW IN VERY CLOSE PROX. AT THIS POINT; I STOPPED OUR ACFT AND THE OTHER PLANE ALTERED COURSE TO HIS L TO AVOID HITTING US. HIS R WING CAME AN ESTIMATED 20 FT FROM OUR ACFT. RAMP TWR Y NEVER GAVE US THIS TFC AS AN ADVISORY; NOR WAS HE ON THE USUAL RAMP Y FREQ. ADD TO THIS THE FACT THAT NORMAL TFC FLOW ON TXWY F IS SBOUND ONLY; SO WE WERE NOT ANTICIPATING SEEING ANYONE FROM THAT DIRECTION. THE SIT WAS RIPE FOR A BAD OUTCOME. CONTRIBUTING FACTORS: ANTICIPATION OF A NORMAL TFC FLOW AND DIRECTING OUR ATTN TO THOSE AREAS. NOT GETTING TA FROM RAMP Y CTLRS. OTHER ACFT TRANSITIONING RAMP AND NOT BEING ON CORRECT FREQ. IN THE FUTURE: TRUST; BUT VERIFY; AND PROCEED ACCORDINGLY.