ac ‧ cus ‧ tom /əˈkʌstəm/ BrE AmE verb [transitive]
[ Word Family: adjective : ↑ customary , ↑ custom , ↑ customizable , ↑ accustomed ; noun : ↑ custom , ↑ customer , customs; verb : ↑ accustom , ↑ customize ; adverb : ↑ customarily ]
[ Date: 1400-1500 ; Language: Old French ; Origin: acostumer , from costume 'custom' ]
to make yourself or another person become used to a situation or place
accustom yourself to something
It took a while for me to accustom myself to all the new rules and regulations.