hacer saber: comunicar o informar. [Uso: existen varias expresiones lexicalizadas con 'hacer + infinitivo'].
-Hizo saber su preocupación — He voiced/expressed his concern
→Le hizo saber su preocupación — He made his concern known to her / He raised his concern with her [Con complemento indirecto de persona]
→→Se lo hizo saber [≈Se lo comunicó]
-Si tengo alguna duda, te lo/la haré saber — If I have any doubts, I'll let you know
→Si tengo alguna duda, te aviso/avisaré [Menos culto]
-Me hizo llegar un mensaje — She got a message to me [Hacer llegar ≈ enviar]
-Me hiciste ver que estaba equivocado — You showed me that I was wrong / You made me realise that I was wrong [Hacer ver ≈ mostrar]