on end

adverb

Roget 212: vertically etc. adj.; up, on end; up on end, right on end; a plomb [Fr.], endwise; one one's legs; at right angles.   

Moby thesaurus: ad infinitum, again and again, at a stretch, at attention, bolt upright, ceaselessly, connectedly, constantly, continually, continuously, cumulatively, cyclically, endlessly, endways, endwise, erectly, incessantly, interminably, monotonously, on a stretch, on and on, perennially, repetitively, right on end, round the clock, together, unbrokenly, unceasingly, unintermittently, uninterruptedly, unrelievedly, up, up on end, upright, uprightly, upstandingly, without a break, without cease, without stopping ... show more.

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