Russian ⇄ English Norwegian Bokmål

держать своё мнение при себе stresses
gen.	keep breath to cool porridge; keep counsel (Дмитрий_Р); suspend judgment (VLZ_58); confine suggestions to own bailiwick; reserve judgment (Ameli); save one's breath to cool one's porridge (Anglophile); keep one's opinions to oneself (bookworm)
Makarov.	confine suggestions to one's own bailiwick; keep one's opinions to oneself
psychol.	keep it to yourself (Alex_Odeychuk)