a·pol·o·gize 
(ə-pŏlə-jīz′)
(ə-pŏlə-jīz′)intr.v. a·pol·o·gized, a·pol·o·giz·ing, a·pol·o·giz·es
1. To make excuse for or regretful acknowledgment of a fault or offense.
2. To make a formal defense or justification in speech or writing.
a·polo·giz′er n.