Sagging
If, on account of unequal distribution of the means employed for lifting flasks, etc., in the foundry, some portion of the suspended object should bend out of parallel, this term would, by moulders, be used to indicate that feature. Or, when some mould surface, as a cope-face, etc., betrays a disposition to separate from the main sand structure on account of faulty workmanship, or otherwise, it is then said to sag.