From Longman Dictionary of Contemporary Englishif you insistif you insistspokenINSIST used when agreeing to do something that you do not really want to do ‘Why don’t you call them up today?’ ‘Oh, if you insist!’ → insist
Examples from the Corpus
if you insist• "Let's invite them over for dinner." "OK, if you insist."• Call it adultery if you insist.• Probably not, if one insists absolutely on the principle of non-repetition.• And if I insisted he came with me, he'd likely cause trouble, just as he said.• However, if they insist on collecting the fee, dump them.• However, if you insist on sawing the post in place, brace it firmly.• This only comes as a shock if we insist on seeing Theo in terms of sainthood.• He thought it would probably confuse them if he insisted on their moving on. 