Definition: Find unexpectedly; find by chance.
Semantic variation: find by chance.
Eg "I came across these old photographs when I was tidying the closet."
Meaning: Meet someone by chance; meet someone unexpectedly.
Gloss: /\CLOSET/\ IX-me CLEAN++ /\HAPPEN+FIND/\ PHOTOGRAPH CL:pile/set.
English equivalent: I came across these photographs when I was tidying the closet.