wax and wane

Grow then shrink

To wax is to grow larger or stronger; to wane is to shrink or diminish.

The phrase comes from the moon's monthly cycle of increasing and decreasing illumination.

Together, wax and wane describes natural fluctuation over time: His enthusiasm waxed and waned throughout the project.

Empires wax and wane across centuries.

cyclical

ebb and flow

Cyclical rise and decline

cycle · rhythm · periodicity · tides · phases · lunar · monthly · seasonal · recurrent · pendulum

decline

diminish

To make smaller

dwindle · fade · wither · abate · crescent · gibbous · twilight · sunset · autumn · senescence

fortune

prosperity

Good fortune, success

luck · circumstance · wheel of fortune · highs and lows · ups and downs · boom and bust · glory · decline · ascent · downfall

growth

flourishing

Prospering vigorously

surging · building · mounting · rising · cresting · peaking · zenith · apex · fullness · ripening

Opposites
cyclical fluctuation vs. constancy

wax and wanehold steady

Remain constant, unmoved

endure · flatline · stay put · plateau · stagnate

natural rhythm vs. controlled stability

wax and wanestabilize

Make firm or constant

regulate · level out · steady · normalize · balance

Family

wax, wane, waxed, waxing, waxes, waxy, waxen, waned, waning

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Used worldwide · Timeless · Everyday, not technical · Rated G