same as polish
Basic skills are polished up, then training is given with those particular jobs in mind.
I could do the job if I spent some time polishing up my Spanish.
It has been polished up and reissued for its 25th anniversary.
You've polished up your Danish and Swedish through The Bridge and The Killing, worked on your French by watching Spiral.
polishes up
polishing up
polished up
There is no origin for this phrasal verb
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