I am really excited about this online Chichewa/Chinyanja dictionary, which I just heard about on Twitter (hat tip @kristungati).
Try entering Mchenga.
Select Chichewa/Chinyanja to English
Click Translate
mchenga 1.sand; maziko ena onse npamchenga = all other foundations are on sand (see: hymn 362, Nyimbo za Mulungu); expression: walemba pamchenga (lit.: you have written in the sand) = you’ve wasted your time; expression: kugwetserana mu mchenga (lit.: throwing one another on the sand) = reconciliation;
Read more at Clement Nyirenda’s blog