A proverb meaning that a desperate person will cling to even the slightest or most useless hope (literally, 'a drowning man will clutch at a straw').
溺れる者は藁をも掴むと言うから、最後の手段でも試してみる価値はある。
They say a drowning man will clutch at a straw, so it's worth trying even a last resort.
借金で困っていた彼は、溺れる者は藁をも掴むように、誰にでも頼み込んだ。
Desperate due to debt, he begged anyone for help, like a drowning man clutching at a straw.