border on something
phrasal verb with border verb uk/ˈbɔː.dər/ us/ˈbɔːr.dɚ/
接近于，近乎
If behaviour, a quality, or a feeling borders on something more extreme, it is almost that thing.
His suggestion borders on the ridiculous. 他的建议近乎荒谬。
She possesses a self-confidence that borders on arrogance. 她的自信接近于自大。