godan verb (-u), transitive verb
Used for physically supporting something to prevent it from falling or collapsing, often with a prop or brace. The kanji 支う is rare; the word is normally written in kana.
倒れそうな棚を棒でかう。
I prop up the shelf that is about to fall with a stick.
重い枝を下からかっておか
If you don't support the heavy branch from below, it will break.