on trend in Polish:

1. modny

Polish word "on trend"(modny) occurs in sets:

tytul lekcji (np owoce po angielsku)
Unit 4 Shopping around 4.2 4.3 4.4 4.5 4.6 4.7
Focus 4 Unit 4 Reading
focus 4 , 4.3 i 4.4
Focus 4 Unit 4 cz 2

2. w modzie

Polish word "on trend"(w modzie) occurs in sets:

angielski 4.1
focus 4 unit 4