The「motions」of「progeny」(「maggots, spermatozoa」with「repeatedly silky sticky threads, human connections」). Obviously older generations of humans are keen to instill in younger generations of humans the concept of「elder is better, progeny is INFERIOR and ought to be HUMBLE, YIELDING to the whims of an elder in every respect」that still underscores the traditional concepts of respect for one's elders and filial piety, particularly in Asia. Nevertheless, after becoming too senile to rule the household, the elders must always eventually ABDICATE power, YIELDING to the next generation in HUMILITY if not while sitting soaked and soiled with incontinence and/or jerking off: TO DEPRECATE ONESELF. It is best for a parent to always remember that one day their children, those「rugrat maggots」will be taking charge (so let's all be nice now).
　Unique to dynastic China where these glyphs originated is the meaning TO DEPRECATE ONESELF with「dripping taut no-longer-integrated foot of grandchild」「repeated head bobbing ejaculations with child in motion」to BECOME INFERIOR: as depicted in erotic Chinese art, men in dynastic China masturbated by wrapping no-longer-integrated feet around an erect penis.「Bound feet were once considered intensely erotic in Chinese culture. …The process was started before the arch of the foot had a chance to develop fully, usually between the ages of 2 and 5. …Qing Dynasty sex manuals listed 48 different ways of playing with women's [no-longer-integrated] bound feet」(after removing the binding cloths, of course)
　　[　https://en.wikipedia.org/wiki/Foot_binding 2012-12-17　]　
　Depicted one generation of silk caterpillars as「maggots」TAKING OVER CONTROL after another generation in a tree, that is, the「maggots that caused a repeat of silk threads」were the progeny of the previous generations of silk caterpillar「maggots」and so on (note that caterpillars are not actually maggots, and neither are maggots actually caterpillars, but each bears some resemblance to the other). Each silk caterpillar moults four or five times as it grows prior to forming a cocoon, and it may be assumed that the larger caterpillars can move faster and eat more than their younger cousins. Be that as it may, caterpillars also apparently have a poor sense of sight, with pigment spot ocelli as not yet fully developed eyes, and move somewhat tentatively, feeling with antennae to the left and right before proceeding. It is this behavior that perhaps accounts for the meaning of this glyph, HUMILITY, YIELDING by reading all the elements as「motions like that of silk maggots.」

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: to abdicate; modest; yielding; unpretentious; inferior to
Japanese: to deprecate oneself and praise the listener, to abase oneself
Unihan extended: humble, modest; yield
EDRDG: humble; modest