Definition of by the sweat of one's brow
- He earned his money by the sweat of his brow.
: to excrete moisture in visible quantities through the openings of the sweat glands : perspire
: to labor or exert oneself so as to cause perspiration
: to emit or exude moisture
: hard work : drudgery
: the fluid excreted from the sweat glands of the skin : perspiration
: moisture issuing from or gathering in drops on a surface
: the projecting upper part or margin of a steep place
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