(usually uncountable) A black, oily, sticky, viscous substance, consisting mainly of hydrocarbons derived from organic materials such as wood, peat, or coal.
Coal tar.
A solid residual byproduct of tobacco smoke.
A sailor, because of the traditional tarpaulin clothes.
Black tar, a form of heroin.
To coat with tar.
To besmirch. Example: The allegations tarred his name, even though he was found innocent.
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