Poor-mouth

[poo r-mouth] /ˈpʊərˌmaʊθ/ Informal.

verb (used without object), poor-mouthed
[poo r-moutht, -mouth d] /ˈpʊərˌmaʊθt, -ˌmaʊðd/ (Show IPA), poor-mouthing.
1.
to lament or argue that one is too poor; plead poverty.
verb (used with object), poor-mouthed
[poo r-moutht, -mouth d] /ˈpʊərˌmaʊθt, -ˌmaʊðd/ (Show IPA), poor-mouthing.
2.
to declare (one’s ability, power, position, etc.) to be inadequate or disappointing, sometimes as an intentional understatement; downplay:
We know you’re just poor-mouthing your skill at playing bridge—you’re a good player.
3.
.
noun, Informal.
1.
a person who continually complains about a lack of money.
2.
a plea or complaint of poverty, often as an excuse for not contributing to charities, paying bills, etc.
Idioms
3.
cry poor mouth, to complain, especially habitually, about a lack of money.
Also, talk a poor mouth.
noun
1.
unjustified complaining, esp to excite sympathy: she always has the poor mouth
verb (transitive)
2.
(informal) to speak of disparagingly; decry

verb

[make a poor mouth, ”to whine, make the worst of things,” is found as Scots dialect by 1822]