to perform or work at (an activity) repeatedly so as to become proficient in it
He practises the drums every day
to carry out or apply (something) in fact or in real situations, as opposed to talking or theorizing about it; to put (something) into practice
They don't seem to practise what they preach
to do (something) actively as part of one's regular behaviour or way of life
to practise politeness
to be a committed follower of (a particular religion)
a practising Christian
to be professionally engaged in (a particular type of work)
to practise medicine
to do repeated exercises for proficiency
She practises at the skating rink every day
to pursue a profession, esp medicine or law, actively
formal (+ on/upon) to take advantage of (someone or something)
He practised on their credulity with huge success — Times Literary Supplement