to keep at, persistir en, perseverar en.
to keep awake (not to go to sleep), quedar despierto.
to keep somebody awake, impedir el dormir a alguien.
to keep books (commercial), tener libros, llevar libros.
to keep down (keep in subjection), sujetar.
to keep down (keep in moderation), moderar.
to keep house, manejar la casa.
to keep hold of, no dejar.
to keep in sight, tener a la vista.
to keep in touch with, no perder comunicación con.