expression, ichidan verb
have a meal beforehand; fortify oneself with food
Used when eating in preparation for some activity, often physical work or a long event. The expression is somewhat old-fashioned and colloquial.
山登りの前に腹を拵えておこう。
Let's have a meal before the mountain climb.
彼は試合の前にしっかり腹を拵えた
He fortified himself with a good meal before the match.