Same proverb as above: advising that one should side with stronger forces rather than oppose them. The ending 'よ' gives a slightly exhortative or literary tone and is seen in written or old-fashioned speech.
祖父はいつも『長い物には巻かれよ』と言って、争いを避けるように教えた。
My grandfather always said '長い物には巻かれよ', teaching us to avoid conflicts.
議会で少数意見が押し切られたとき、彼は『長い物には巻かれよ』と冷静に言った。
When the minority position was overruled in the assembly, he calmly said, '長い物には巻かれよ.'
この土地では昔からの慣習が強い。長い物には巻かれよ、と言うしかない。
Old customs are strong in this region. There's nothing to do but follow them, as the proverb says.