古英語のstreaw「草」から、原ゲルマン語の *strawa「草」から、PIE *strew「広げる、広がる、展開する」から。
Let it not, however, be inferred that taxation cannot be pushed too far : it is, as the Oriental proverb says, the last straw that overloads the camel ; a small addition, if ill-timed, may overturn the whole. ["The Scots Magazine," April 1799]