かこつける

かこつける 【託つける 】【口実とする 】make * a pretext ｟of ｠.▸ 何とかかこつけて on some pretext or other .▸ 彼は病気にかこつけて学校を休んだ He didn't go to school on [under ] the pretext of being sick .He didn't go to school by pretending to be sick .