Verb
To boil or cook thoroughly.
To boil in part; to cook partially by boiling.
Source: Webster's dictionaryParboil the beans before freezing them Source: Internet
Add broccoli in the last couple minutes to parboil. Source: Internet
Divide the veg between a few large pans (keeping the beets separate), cover with boiling salted water and parboil for 10 to 15 minutes, or until starting to soften. Source: Internet