To exchange positions (with another)

(intransitive, baseball) To throw a pitch at a much slower than expected speed. / (intransitive) To confuse someone by doing something unexpected or in an unexpected way.

plural of changing room

(phonology) Any process of language change that affects pronunciation (phonetic change) or sound system structures (phonological change)

That contributes to climate change

plural of change order

Coins of little value kept in one's pocket or bag. / (idiomatic) A sum of money considered small or insignificant.

The changing of clocks one hour forward or backward, in line with daylight saving time.

(military, archaic) To turn a horse around; especially, when exercising in a circle, to cross the center and resume circling in the other direction.

(usually preceded by the) A ceremony during which the soldiers or other officials guarding a major government building or state residence, especially Buckingham Palace in England, are replaced by a new shift.