zhèng​hǎo HSK2

happen to

正好 zhèng​hǎo
happen to descriptive
by chance or coincidence; it so happens that

I was just about to look for him when I happened to run into him on the way.

just right descriptive
precisely in amount, size, or degree; just enough

The size of this garment fits me perfectly.

just in time descriptive
occurring at the exact moment needed

You've come at the perfect time; we are just about to start the meeting.

Frequency

Movie subtitles
63.1 per million appears in 25% of films
Written text
33.5 per million

Details

HSK 2.0
Level 4
HSK 3.0
Level 2

Sources

Definitions
CC-CEDICT