Korean verbs can be marked with both referent and addressee honorific morphology.An analysis of a teledrama corp us and a phone call corp us shows that these two morp hological classes co-occur in a biased distribution indicating an association between the two classes.An experiment was conducted to determine whether Korean heritage speakersacquisition of Korean was affected by this association as would be predicted by the distributional bias hypothesis.Twenty heritage learners of Korean performed a teledrama oral translation task which elicited two addressee honorific styles with and without referent honorific marking.A repeated measures ANOVA on the four possible addresseereferent honorific combination showed differences in p erformance.A post hocanalysis of pairwise contrasts indicated that performance was superior on the referent honorific(R H)plus hayyo addressee honorific(A H)combination relative to the RH plus hay AH combination.This result is incompatible with an account that explains acquisition in terms of the cumulative freq uencies of the forms in inp ut.It is also incomp atible with accounts claiming that learners do not associate the forms during the acquisitional process.It is argued that the distributional bias hy p othesis best accounts for the pattern of results and the frequency-driven conflation of semantically related concatenated affixes may have special significance foragglutinative languages such as Korean. Korean verbs can be marked with both referent and addressee honorific morphology. An analysis of a teledrama corp us and a phone call corp us shows that these two morp hological classes co-occur in a biased distribution indicating an association between the two classes. An experiment was conducted to determine whether Korean shall speakers are acquisitions of Korean was affected by this association as would be predicted by the distributional bias hypothesis. TWA heritage learners of Korean performed a teledrama oral translation task which elicited two addressee honorific styles with and without referent honorific marking .A repeated measures ANOVA on the four possible addresseereferent honorific combination showed differences in p erformance. A post hocanalysis of pairwise contrasts indicating that performance was superior on the referent honorific (RH) plus hayyo addressee honorific (AH) combination relative to the RH plus hay AH combination. This result is incompatible with an account that explaining acquisition in terms of the cumulative freq uencies of the forms in inp ut.It is also incomptible with accounts claiming that learners do not associate the forms during the acquisitional process .It is argued that the distributional bias hy p othesis best accounts for the pattern of results and the frequency-driven conflation of semantically related concatenated affixes may have special significance foragglutinative languages ​​such as Korean.