Opposition
Noun, する verb, and の adjective
たいりつ
あととりあらそいで、兄と弟は対立してしまったんです。
The older and younger brothers are in opposition over the succession dispute.
対立するんじゃなく、一しょにきょう力してがんばろうよ！
Why don't we cooperate and work hard together instead of competing?
もう一回俺のことを対立を避けるような人間だと言ってみろ！お前の顔面をぶん殴ってやる。
I’ll punch you in the face if you say I’m a non-confrontational person one more time.
When you stand up versus someone, you're looking to get into a confrontation. Just imagine yourself doing this to someone bigger than you. You stand up to versus them and then realize this confrontation is a bad idea.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.