c.1300, lumpe, perhaps from a Scandinavian source (cf. cognate Dan. lumpe, 16c.), of unknown origin. Phrase lump in (one's) throat "feeling of tightness brought on by emotion" is from 1803. Lumps "hard knocks, a beating" is colloquial, from 1935. Lump sum, one covering a number of items, is from 1867.
"endure" (now usually in contrast to like), 1791, apparently an extended sense from an older meaning "to look sulky, dislike" (1577), of unknown origin, perhaps a symbolic sound (cf. grump, harumph, etc.).