SLUMP, verb intransitive To fall or sink suddenly into water or mud, when walking on a hard surface, as on ice or frozed ground, not strong enough to bear the person. [This legitimate word is in common and respectable use in New England, and its signification is so approriate that no onther word wil supply its place.]
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI