~になる (become)
grammar213 sentences
The structure [noun/na-adj]+に+なる (and [i-adj stem]+く+なる) expressing change of state — 'become X / turn into X / come to be X.' The に-marker shows the result of the change. 医者になる ('become a doctor'), 春になる ('spring comes'), 静かになる ('become quiet'). The transitive counterpart ~にする means 'make something into X.'