small coal; also, coal dust; culm.-a valley, or small, shallow dell.-lax; not tense; not hard drawn; not firmly extended; as, a slack rope.-weak; not holding fast; as, a slack hand.-remiss; backward; not using due diligence or care; not earnest or eager; as, slack in duty or service.-not violent, rapid, or pressing; slow; moderate; easy; as, business is slack.-slackly; as, slack dried hops.-the part of anything that hangs loose, having no strain upon it; as, the slack of a rope or of a sail.-alt. of slacken-alt. of slacken