Alternative form of in a one-er

(informal) in one attempt

(education) A grade lower than "A" and higher than "B plus".

(medicine) Of a blood type within the ABO and Rh blood grouping system. Blood type A negative has a phenotype of "A" and a Rhesus system classification of negative.

(medicine) Of a blood type within the ABO and Rh blood grouping system. Blood type A positive has a phenotype of "A" and a Rhesus system classification of positive.

An academic grade issued by certain educational institutions. Slightly better than an A. / (slang) The highest possible rating.

To swim.

plural of rope-a-dope

(boxing) A technique in which the boxer assumes a defensive stance against the ropes and absorbs an opponent's blows, hoping to exploit eventual tiredness or a mistake.

(figuratively) To exhaust someone by stringing them along.