The opposite of acclimatize is de-acclimatize.
This means to adapt, especially to environment or climate. Here are some sentences.We need to acclimatize to the altitude.The animals will acclimatize to their new home.
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Part of an astronaut's training is done in pool so they acclimatize more quickly to weightlessness in space. It would probably be better for you to use the word "acclimate" instead of "acclimatize". Both are correct, but acclimate is much more widely used and accepted.
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This means to be able to acclimatize to a new situation.
familiarize, train, discipline, adapt, instruct, school, acquaint, acclimatize
familiarize, train, discipline, adapt, instruct, school, acquaint, acclimatize
modified, tailored, alter, become accustomed to, adjust, acclimatize, etc
The climate of the room got warmer and warmer as we held each other passionately in a scandalous way.
Swimming english channel
The term climatize (UK climatise) is more often expressed as "acclimatize" (to become acclimated, accustomed to an environment).
To reach the summit of Mount Everest can take anywhere between 4 to 8 weeks. You have to allow time for your body to acclimatize to the high altitude, then you must wait for the right weather window to allow you to climb to the summit and back safely.