Proverbs 30:21

19 the way of an eagle in the sky, the way of a snake on a rock, the way of a ship at sea, and the way of a man with a maiden.

20 This is the way of an adulteress: She eats and wipes her mouth and says, ‘I have done nothing wrong.’

Under three things the earth trembles, under four it cannot bear up:

22 a servant who becomes king, a fool who is filled with food,

23 an unloved woman who marries, and a maidservant who supplants her mistress.

This was said to Israel at a particular time, so it is wise to read it together with the surrounding text. Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
Under three things the earth trembles, under four it cannot bear up:
KJV
For three things the earth is disquieted, and for four which it cannot bear:
WEB
“For three things the earth trembles, and under four, it can’t bear up:
ASV
For three things the earth doth tremble, And for four, [which] it cannot bear:
DARBY
Under three [things] the earth is disquieted, and under four it cannot bear up:
BLB
For three things the earth has trembled, and for four it is not able to bear up:
ÅB
Under tre skjelver jorden, og under fire kan den ikke holde ut:
OTB
Under tre ting skjelver jorden, under fire kan den ikke holde ut:
B1930
Under tre skjelver jorden, og under fire kan den ikke holde ut:

Study notes (Tyndale)

Original text and word study