I've always had this problem phrasing this sentence.
what can I put in this gap?
'' when I was reading an article, I .... this new phrase/word which I don't know the meaning''
when I was reading a text,
- I faced this new phrase/word
- I came across this new phrase/word
- I ran into this phrase/word
or maybe there is a better way of asking that I'm not aware of.