Definition of mashallah in US English:

mashallah

exclamation

  • In Muslim countries, expressing praise or resignation: ‘(this is) what God wills’. Later also in extended use.

Origin

Early 19th century. From Arabic mā šā'a llāh ‘whatever God will!’, ‘This is what God has willed!’ from mā what, whatever + šā'a to wish + Allāh God.