accustom
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verb with object
make (someone or something) accept something as normal or usual:
«…に/…することに» 〈人･動物など〉を慣らす, なじませる «to/to doing»
e.g. I accustomed my eyes to the lenses
e.g. they tried to accustom him to their lighthearted ways.
(be accustomed to) be used to:
e.g. my eyes gradually became accustomed to the darkness.
ORIGIN
late Middle English: from Old French acostumer, from a- (from Latin ad ‘to, at’) + costume ‘custom’.