border on sth:
If behaviour, a quality, or a feeling borders on something more extreme,
it is almost that thing 接近於/幾乎
這句用法要看例句才會清楚! 比較多負面用法。
例句：
● His suggestion borders on the ridiculous. 他的建議根本荒謬。
● She possesses a self-confidence that borders on arrogance.
● That plan borders on insanity.
