An adverb meaning 'to the end' or 'in full'. Often used in expressions like 'don't say everything' (e.g., みなまで言うな).
みなまで言うな。事情は分かっているから。
Don't say everything. I understand the situation.
詳細はみなまで聞いていないが、大筋は把握している。
I haven't heard all the details, but I grasp the general outline.
彼女は恥ずかしさでみなまで話せなかった。
She couldn't tell everything because of embarrassment.