even if I have to; by all means~
This pattern expresses doing something by all means, even if it requires extreme or undesirable methods.
てでも is used when you say you will achieve a goal even if it involves hardship, breaking rules, or doing something you normally wouldn't. It stresses determination. The pattern is often used with expressions like 〜てもいい, 〜たい, or 〜するつもり to show strong will. For example, 'I'll go even if I have to walk' means you'll go despite the effort. It sounds a bit emphatic, so it's common in speeches, strong opinions, or when making a firm promise.