Enables DNA-binding transcription repressor activity, RNA polymerase II-specific; RNA polymerase II cis-regulatory region sequence-specific DNA binding activity; and identical protein binding activity. Acts upstream of or within several processes, including embryonic foregut morphogenesis; lung secretory cell differentiation; and negative regulation of lung goblet cell differentiation. Predicted to be active in nucleus. Is expressed in several structures, including central nervous system; genitourinary system; gut; hindlimb digit mesenchyme; and skeleton. Orthologous to human FOXP4 (forkhead box P4). [provided by Alliance of Genome Resources, Apr 2022]