sweat

1*. sweat (vi/vt; sweat or sweated, sweating): to fret or worry (about); especially, to worry excessively. 2*. sweat (vi/vt; see 1): to work hard or diligently. "to sweat it out:" "to achieve a goal through hard work;" "to endure;" "to persevere or overcome;" also, "to suffer withdrawal symptoms;" "to kick a (drug) habit;" "to overcome a drug addiction." *in senses 1 or 2: "to sweat bullets" or "to sweat blood:" to worry frantically or to work strenuously. (allegedly, sweating blood is an actual but rare medical condition in which the blood from bursting capillaries mixes with the perspiration of nearby sweat glands.) 3. sweat (n): problem, difficulty; e.g., "a mountain of sweat:" "a difficult task," but in this sense often used negatively, with "no:" "no sweat:" "no problem;" sc "you're welcome." 4. sweat (n): american postal slang for mail that does not belong at the indicated address (e.g., because it is addressed to recipients who no longer live there), especially machine-sorted mail that letter carriers must therefore bring back to the station after carrying to the street. "sweaty:" adjective describing such mail, mail that contains a fair amount of "sweat," or mail that tends to be undeliverable. 5. sweat (vt): pipefitter's term for soldering together two lengths of metal pipe, typically used with "-fit:" "sweat-fit" (-fit or -fitted, fitting).