noun, noun or participle which takes 'suru'
having a meal beforehand; eating to prepare for something
Used when you eat before an activity that requires energy or when you might not get another chance to eat soon. Often implies a practical, fortifying meal.
山登りの前にしっかり腹ごしらえをした。
I had a good meal before the mountain climb.
試合の前に腹ごしらえしておかないと、
If you don't eat something before the match, you'll get hungry during it.